The difference with Wall in college was his athletic capability was far superior to the opponents he was facing...so he could put up big numbers with a shitty jump shot. In the league, he'll have athletes jumping out on that shitty release and wont have the ability to dominate.
He's like Evans IMO, he had a shitty jumper at Memphis...but worked on it over his 1st season while being allowed to make mistakes and moments of brilliance. Which is what Wall should be allowed to do.