Those other defenses are probably less complex and most of them have players facing the QB and coming up and blasting opponents while are guys are trying to remember all those damn assignments while chasing WR's with their backs to the QB. It's the reason Tebow looks like a star against us while looking like absolute trash vs New England.
board meetings are very stressful
Even if Bill Belichick was getting an atomic wedgie, his face would look exactly the same.
Troy is no longer the Troy of 5 years ago. You can't have him running all over the field out of position. His last great year with INTs was 2010 with 7. It is not a coincidence with him running all over the place and essentially being a key reason why we were one of the worst teams in the league for giving up long plays.