Why would a coach keep this kid benched longer? Hes pissed off, hes unhappy, and he wants to prove himself, he wants to prove people wrong, he wants to show what hes got. I'd throw him out on the field for 10-15 carries a game, and see what hes got. If he does well I'd keep playing him. The desire and motivation is there, hes making noise, I'd shut him up and let him prove himself.