They could've let him play. There was a point in this game when Petty looked like he was starting to get hot. He was flashing but instead of letting their third year QB play the coaches put the training wheels back on treated him like a rookie again. Game over.
Petty is a fucking mess. The only thing more embarrassing than being Petty is thinking the coaching staff screwed him over.
At least the Petty supporters can't (make that shouldn't..we all know they'll support him even after he's out of the league next year) argue that he's any good. He is a heaping pile of dog shit. It's time they cut Petty and Hack, sign McCown to be the back up next year and get a franchise QB.