swansea jack Have you ever played wing back?? It is a much harder position to play, especially if you are poor at getting back, and you need to be a hell of a lot fitter!!! If he can't play right back, which along with left back is the easiest position on the pitch, then there is little hope at wing back!
Wing backs are indeed a difficult position to play in as you'd need the player to get back after wandering up the field. Hence probably the reason why 3-5-2 isn't used much these days.