I think Biliew is social proof on how bad the AAU basketball system is for youth basketball. If AAU basketball was a diet it would be junk food / KFC/Taco Bell.
It's entirely about 1 on 1 basketball with little passing, run up the floor, and occasional jacked 3's.
When you put a player into a team system - that changes things for some recruits. This guy was never going to be a good player in a system because of things like passing ability, basketball IQ, and shooting touch. If a player does not have that you are just going to be a role guy, and he's essentially a role guy.