This will start off topic, but I'll bring it back. Years ago, I read Joe Garagiola's biography. He said, roughly, "The kids who get to play ball in high school are the best from the surrounding neighborhoods. The ones who get a shot at the minors are the best players that anybody they knew had ever seen. The ones to make the majors were the cream of the crop of four levels of that. I wasn't even the best player on my block". (His best friend growing up and throughout his life was Yogi Berra).
Most of these players have never seen anyone nearly as good as they are. The players getting a scholarship in the ACC are blowing away any competition they've ever seen. They're playing AAU because they don't see enough competition in high school to show their talent, and they're blowing that competition away. It's a rude awakening for a lot of them when the athletes on the other side are suddenly better than they are.