ranked on average #50 and he's never had an "elite" defense. He's been in the top 15 once (at #14), and barely got into the top 20 two other times (both at #19). Further, he's certainly never shown he can sustain a program's defensive ranking. These 3 years are clearly exceptions, not the rule.
There are several other coaches out there who can claim to have legitimate defensive programs. Cuonzo Martin is not one of them.
Year - Def Efficiency Rank
@ Tennessee
2011/12 - #40
2012/13 - #101
2013/14 - #19
@ Cal
2014/15 - #79
2015/16 - #19
2016/17 - #14
@MU
2017/18 - #43
2018/19 - #51
2019/20 - #81 (so far. likely to fall from here)
https://kenpom.com/index.php?s=RankAdjDE