I think for MG it was a developmental issue, but I'm not sure who's to blame, in a way I think he was sort of a mental midget.
The guy literally did not develop a left hand for four years. He never figured out how to use the rim to protect from shot blockers. Those are things that many high school players can do.
I agree. His shot got worse and he was horrible in crunch time. It was all mental. The few games where he had confidence he was really good.