Yeah, Percy was just not an explosive athlete. Smooth, but deliberate. He was big, but not overly so where he would have success off that alone. He also had problems keeping the ball high.
He was at his best playing off of Royce White's greatness, but you probably could have put just about any big there and have similar results. But he did seem to work well without the ball and have good bball IQ, so credit to him for that.
To your point about competition, I think he transferred down to Detroit Mercy or something like that. Unfortunately, bigs at his size are still really hard to project unless they are a lot bigger.