
Need to see him suck more to come to the conclusion he can't play?
In short, yes.
We all agreed that the offensive game plan and coaching was suspect last season. Its a variable that has an effect on other variables, like QB play. Its your OPINION that he "blew three games on his own" when in fact no one knows what went wrong in those games, and surely multiple people played a part in the loss (hello, Carpenter missed 4 FG's in the Buffalo game).
So, yes, if we give him a new scheme and new coaches, and he still sucks, I will be convinced that he is a terrible QB. Until then, its pure speculation.