He needs a 40 game+ season, free from injury, so that he can concentrate totally on improving his areas of weakness. He's got everything in his game to become a world class fullback - I've said that since the beginning - but he has one or two parts of his game, his crossing and final ball most importantly, that simply must improve if he's to really become the best.
I think right now he's all-round game is very good though. He's good at both ends of the pitch. I just know he can be better.