Sure....LOL....NFL offenses seldom have much to do with how the QB plays. Also, Wonderlick scores never indicate red flags either. Google KPs score.
I like the guy as a person from what I've seen and heard about him, but he bears culpability with what we've seen this year on offense. You've not read/watched enough analysis on his actual play on the NFL field. There's a small chance that the playcalling was limited by organizational knowledge of what he can and cannot do.
If you want to blame his lack of growth on coaching, fine. But there are myriad OBVIOUS examples where he simply DID NOT hit the right guys or make the plays that were there. He has simply not been good enough, and it's not all offensive scheme.