He used to be a decent DC but not good
NCAA Ranking of Chavis defense
A&M 2017 78th
A&M 2016 90th
A&M 2015 51st
LSU 2014 9th
LSU 2013 15th
LSU 2012 8th
LSU 2011 2nd
LSU 2010 12th
LSU 2009 26th
Just like with Bob Shoop, Chavis didn't all of a sudden stop being a very good DC. What's shocking is LSU letting him get away. Would be interesting to hear his side of what happened.
Anyway, best of luck to him. Calling a longtime solid defensive coordinator and one of the best paid who's a VFL an idiot, just means you're the idiot.