It may also be that he just doesnt look natural on the left like most left footed wingers and some right wingers who have made the role their own, like Ribery.
So even when he plays very well on the left and creates goals for us with good play, people may still feel a bit funny about him because he just doesnt look quite as natural there as they'd want from their left winger. Which could give the impression that he's not the solution in that position, even though he's clearly got so much talent and he can play well there. Again, it's about patience. Over the years he should start to look more natural there - but he has played there quite a lot now and he doesn't really look more natural than in his first season when we played him there. Its not a deal breaker at all though when he can still play very well in the position.