If they had sold him and bought someone else then that player could be the one that wins them the big trophies.
Ifs and buts by all means, i am just saying he is not a top player because he is a liability when it really matters. Ronaldo or Messi dont have a good game then they dont have a good game. they never cost their team a result though either and that is the difference.
It matters in every single game, how the hell can a player who leads the goals and assists charts be a liability? Give up mate, ffs. He scored against pretty much all the big clubs last season from what I remember. He is in the top 3/4 strikers in the world. No doubt.