If Gary's system is truly elite, then we'd be in shoot-outs in the game vs Packers, and the two games vs Patriots.
Remove Wade's defense from the equation. Wade's defense isn't calling plays for Matt on 3rd and 15 from our own 9-yard-line (a regular occurrence for the Texans in 2012, by the way). Wade's defense isn't throwing the ball into the dirt, to escape pressure, when there's time to hold on one more second and find an open man.
Wade's defense was gutted in the LB position, and a few of our DBs were missing here and there, too. Gary's offense is only capable of running a marathon if he's got a stacked defense (like we had in 2011). Take Wade's defense away, which happened in 2012 via injuries to LBs and DBs, and we see what happens: The offense can't produce; Gary wilts and so does his QB.