You don’t just become lame all of the sudden when your shooting form was very good fundamentally. The few extra inches doesn’t matter in college from HS distance. It’s all mental and he lost his edge somehow once he got to BYU. Bet he was a great practice shooter still at BYU. Mental game needs some work for real game time situations. That’s all I can think of as he seems to have lost all of his basketball tools except for rebounding.