Not really agree about this, every players is average before they becoming a world class. A average player on his best performance, that's a big potential to become world class. Plus, he didn't get much time and suitable spot under Wenger.
Average is not the right term for this, some players have extraordinary skills that differ them from the rest of the team even when they are not scouted yet . They have the potential yet they have no place to showcase it therefore with the right coach those kind of players could flourish more to be a talented player