Exception rather than the rule , are you sure? young players do improve and maybe last season he was in the right place and club so no reason to think he could not improve more.It's great money for a player who realistically won't be near the first team next season though.
Sorts our financial issues and realistically his season last season looks like the exception rather than the rule; it's time to cash in for me.
Maybe a little more faith in some players that we have helps instead of bringing in other young players who may not cut it, it's better to keep some he at least would run himself to a stand still for the shirt.