We owe him nothing. He has been handed a golden opportunity that others would kill for. The fact that after two years he is still skinny is a joke. He has quality facilities, dieticians, weights/fitness coaches who can all assist him in bulking up.
The kid should have been locked in the gym 24/7 when he was injured and couldn't run.
I'd much rather rookie the best players available than some bloke who had his chance and didn't take it with both hands. Two years is plenty of time.