Its not my fault he can't do the basics of a fullback role. They are very obvious.
How do you think lots of rightbacks make their careers in the game when they arent even close to the athletic ability of Valencia?
They aren't a liability positionally and don't foul throw everytime they are expected to take a throw in - which if you count it, its likely to be like 3 or 4 per half in a decent team. Those are the very basics you are taught at a young age, its not my fault if Valencia foul throws and is out of position all the time. Someone like Phil Bardsley can manage those things, they are very simple.
If anyone seriously thinks all a fullback needs to do is what Valencia does well, make some tackles and make runs, then I dont think they understand football. Its a team game, especially defensively and those are individual things that might catch the eye of the casual observer - same as sprinting back and tackling Aguero, but most of a fullback's game is not going to be a highlight reel. Everytime a fullback steps up and plays Aguero offside instead might not stand out as much, but its far better defending.