Disagree. Diaz started the "bend, but don't break" philosophy. Outside of a few stats, the only difference is, we blitzed a lot under Manny. Not so much with Wison. The stats aren't as different as you would think, though. Look at this link:
http://www.cfbstats.com/2012/team/430/index.html
This year, we averaged right at 30 minutes in time of possession. In 2010, we averaged 31 minutes. We also gave up a good many total yards both years (2012- 5,036, 2010- 4,639) and teams had a respectable 3rd down conversion rate against us (2012- 42.08%, 2010- 37%). I'm not making these numbers up. The DIFFERENCE between Manny and Wilson was red-zone success...
This year, our opponents had 44 attempts in the red zone and scored 35 of those 44 attempts (80%). Opponents averaged 23.3 points per game. In 2010, out of 40 attempts in the red zone (only 4 fewer attempts than this year), teams scored only 29 times (65%). Opponents also averaged 19.8 points per game (with a MUCH tougher schedule).
The stats point to the difference between Manny and Wilson. Manny's defense gave up a lot of yards, gave up a lot of 3rd down conversions, and did not force as many punts as you would think.
Those of you thinking Manny was some kind of defensive god can give it up, because there wasn't as big a difference as you would think. Manny defined the "bend, but don't break defense." Mullen talked about it when he hired Manny. The difference, I can't stress enough, was that Manny's defense gave up far fewer TOUCHDOWNS than Wilson's. In case you have forgotten, FGs = 3 points, TDs + a try = 7 points.