What 1mPeRvI0uS said. As far as skill goes, I think pronax is good. I think he's doing his share of kills, and more importantly, he is the in-game leader so I dought they would do as good without him.
Though, in fairness, BARBARR has been a in-game leader to (in other teams). But I don't think he is as good, and also, my guess is that if he were to take over that role it would have a negative effect on his fragging, which, right now is impressive.