"All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness, that the man of God may be complete, thoroughly equipped for every good work."
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Not every book has the same audience, not all of the same subject matter.
How is it that you think they must convey everything covered in other writings?
Mark
The beginning of the gospel of Jesus Christ, the Son of God. ...
“There comes One after me who is mightier than I, whose sandal strap I am not worthy to stoop down and loose. I indeed baptized you with water, but He will baptize you with the Holy Spirit.”
and was baptized by John in the Jordan. And immediately, coming up from the water, He saw the heavens parting and the Spirit descending upon Him like a dove. Then a voice came from heaven, “You are My beloved Son, in whom I am well pleased.”
Immediately the Spirit drove Him into the wilderness. And He was there in the wilderness forty days, tempted by Satan, and was with the wild beasts; and the angels ministered to Him. ...
Now there was a man in their synagogue with an unclean spirit. And he cried out, saying, “Let us alone! What have we to do with You, Jesus of Nazareth? Did You come to destroy us? I know who You are—
the Holy One of God!”
When Jesus saw their faith, He said to the paralytic, “Son, your sins are forgiven you.”
And some of the scribes were sitting there and reasoning in their hearts, “Why does this Man speak blasphemies like this? Who can forgive sins but God alone?”
But immediately, when Jesus perceived in His spirit that they reasoned thus within themselves, He said to them, “Why do you reason about these things in your hearts? Which is easier, to say to the paralytic, ‘Your sins are forgiven you,’ or to say, ‘Arise, take up your bed and walk’? But that you may know that the Son of Man has power on earth to forgive sins”—He said to the paralytic, “I say to you, arise, take up your bed, and go to your house.” Immediately he arose, took up the bed, and went out in the presence of them all ...
And the unclean spirits, whenever they saw Him, fell down before Him and cried out, saying, “You are the Son of God.” But He sternly warned them that they should not make Him known. ...
And a great windstorm arose, and the waves beat into the boat, so that it was already filling. But He was in the stern, asleep on a pillow. And they awoke Him and said to Him, “Teacher, do You not care that we are perishing?”
Then He arose and rebuked the wind, and said to the sea, “Peace, be still!” And the wind ceased and there was a great calm. ...
When he saw Jesus from afar, he ran and worshiped Him. And he cried out with a loud voice and said, “What have I to do with You, Jesus, Son of the Most High God? I implore You by God that You do not torment me.”
For He said to him, “Come out of the man, unclean spirit!” Then He asked him, “What is your name?”
And he answered, saying, “My name is Legion; for we are many.” Also he begged Him earnestly that He would not send them out of the country.
Now a large herd of swine was feeding there near the mountains. So all the demons begged Him, saying, “Send us to the swine, that we may enter them.” And at once Jesus gave them permission. Then the unclean spirits went out and entered the swine (there were about two thousand) ...
Now a certain woman had a flow of blood for twelve years, and had suffered many things from many physicians. She had spent all that she had and was no better, but rather grew worse. When she heard about Jesus, she came behind Him in the crowd and touched His garment. For she said, “If only I may touch His clothes, I shall be made well.”
Immediately the fountain of her blood was dried up, and she felt in her body that she was healed of the affliction. And Jesus, immediately knowing in Himself that power had gone out of Him, turned around in the crowd and said, “Who touched My clothes?”
But His disciples said to Him, “You see the multitude thronging You, and You say, ‘Who touched Me?’ ”
And He looked around to see her who had done this thing. But the woman, fearing and trembling, knowing what had happened to her, came and fell down before Him and told Him the whole truth. And He said to her, “Daughter, your faith has made you well. Go in peace, and be healed of your affliction.” ...
Then He came to the house of the ruler of the synagogue, and saw a tumult and those who wept and wailed loudly. When He came in, He said to them, “Why make this commotion and weep? The child is not dead, but sleeping.”
And they ridiculed Him. But when He had put them all outside, He took the father and the mother of the child, and those who were with Him, and entered where the child was lying. Then He took the child by the hand, and said to her, “Talitha, cumi,” which is translated, “Little girl, I say to you, arise.” Immediately the girl arose and walked, for she was twelve years of age. And they were overcome with great amazement. ...
And when He had taken the five loaves and the two fish, He looked up to heaven, blessed and broke the loaves, and gave them to His disciples to set before them; and the two fish He divided among them all. So they all ate and were filled. And they took up twelve baskets full of fragments and of the fish. Now those who had eaten the loaves were about five thousand men. ...
Now about the fourth watch of the night He came to them, walking on the sea, and would have passed them by. And when they saw Him walking on the sea, they supposed it was a ghost, and cried out; for they all saw Him and were troubled. But immediately He talked with them and said to them, “Be of good cheer! It is I; do not be afraid.” Then He went up into the boat to them, and the wind ceased. ...
And as many as touched Him were made well. ...
And He took the seven loaves and gave thanks, broke them and gave them to His disciples to set before them; and they set them before the multitude. They also had a few small fish; and having blessed them, He said to set them also before them. So they ate and were filled, and they took up seven large baskets of leftover fragments. Now those who had eaten were about four thousand. ...
Mark 8
and on the road He asked His disciples, saying to them, “Who do men say that I am?”
So they answered, “John the Baptist; but some say, Elijah; and others, one of the prophets.”
He said to them, “But who do you say that I am?”
Peter answered and said to Him, “You are the Christ.”
Then He strictly warned them that they should tell no one about Him.
And He began to teach them that the Son of Man must suffer many things, and be rejected by the elders and chief priests and scribes, and be killed, and after three days rise again. He spoke this word openly.
How is it that you do not know that the scriptures teach that Christ is the eternal I AM?
I'll add more from Mark, where Christ told the disciples He would rise from the dead, after He claimed the right to forgive sin, which is reserved to God alone.
"Now after six days Jesus took Peter, James, and John, and led them up on a high mountain apart by themselves; and He was transfigured before them. His clothes became shining, exceedingly white, like snow, such as no launderer on earth can whiten them. And Elijah appeared to them with Moses, and they were talking with Jesus. Then Peter answered and said to Jesus, “Rabbi, it is good for us to be here; and let us make three tabernacles: one for You, one for Moses, and one for Elijah”— because he did not know what to say, for they were greatly afraid.
And a cloud came and overshadowed them; and a voice came out of the cloud, saying, “This is My beloved Son. Hear Him!” Suddenly, when they had looked around, they saw no one anymore, but only Jesus with themselves.
Now as they came down from the mountain, He commanded them that they should tell no one the things they had seen, till the Son of Man had risen from the dead. So they kept this word to themselves, questioning what the rising from the dead meant." - Mark 9
"Then James and John, the sons of Zebedee, came to Him, saying, “Teacher, we want You to do for us whatever we ask.”
And He said to them, “What do you want Me to do for you?”
They said to Him, “Grant us that we may sit, one on Your right hand and the other on Your left, in Your glory.”
But Jesus said to them, “You do not know what you ask. Are you able to drink the cup that I drink, and be baptized with the baptism that I am baptized with?”
They said to Him, “We are able.”
So Jesus said to them, “You will indeed drink the cup that I drink, and with the baptism I am baptized with you will be baptized; but to sit on My right hand and on My left is not Mine to give, but it is for those for whom it is prepared.”" - Mark 10
What mere man would have spoken about having His own throne from which to rule in His glory?
"Jesus answered and said to them, “Are you not therefore mistaken, because you do not know the Scriptures nor the power of God? For when they rise from the dead, they neither marry nor are given in marriage, but are like angels in heaven. But concerning the dead, that they rise, have you not read in the book of Moses, in the burning bush passage, how God spoke to him, saying, ‘I am the God of Abraham, the God of Isaac, and the God of Jacob’? He is not the God of the dead, but the God of the living. You are therefore greatly mistaken.”
Then one of the scribes came, and having heard them reasoning together, perceiving that He had answered them well, asked Him, “Which is the first commandment of all?”
Jesus answered him, “The first of all the commandments is: ‘Hear, O Israel, the Lord our God, the Lord is one. And you shall love the Lord your God with all your heart, with all your soul, with all your mind, and with all your strength.’ This is the first commandment. And the second, like it, is this: ‘You shall love your neighbor as yourself.’ There is no other commandment greater than these.”
So the scribe said to Him, “Well said, Teacher. You have spoken the truth, for there is one God, and there is no other but He. And to love Him with all the heart, with all the understanding, with all the soul, and with all the strength, and to love one’s neighbor as oneself, is more than all the whole burnt offerings and sacrifices.”
Now when Jesus saw that he answered wisely, He said to him, “You are not far from the kingdom of God.”
But after that no one dared question Him.
Then Jesus answered and said, while He taught in the temple, “How is it that the scribes say that the Christ is the Son of David? For David himself said by the Holy Spirit:
‘The Lord said to my Lord,
“Sit at My right hand,
Till I make Your enemies Your footstool.” ’
Therefore David himself calls Him ‘Lord’; how is He then his Son?”
And the common people heard Him gladly." - Mark 11