As we learned with DB, the QB can make an O-line look a lot worse than it is. Having a QB with the ability to step up and move around in the pocket is a huge advantage for the line.
The Texans' message board is going ballistic about their poor O-Line play, but I thought Carr was to blame for a lot of it. The guy looks like a younger version of Bledsoe...big wind up, pat pat pat, no poclet presence, etc.