He's still a developmental prospect. He's great on the ball, hugely progressive with it, passing numbers & stats are fantastic. Not quite there physically and lacks a bit in the defensive side of his game at present.
The stuff he can do well is natural ability and can't be taught, the stuff he can improve on is learned behaviour and can be coached and developed.
He is an 8 rather than a 6, but would be a fantastic signing at £15/20m and gives us another player with quality on the ball in midfield.