He hasn't proved it so far. In fact, he's been a bit shit playing there. Only versus Porto, when he scored the wonder goal, did he ever give a masterclass performance in that position. He doesn't have Fabregas, Wilshere or Ramsey's eye for a pass in that role. Even Song is better in that area. Nasri's best position is where Wenger has played him for most of his Arsenal career. He can utilise his dribbling, pace and shooting on the wing most effectively. His hogging of the ball for too long leads nowhere when he's playing centrally. It's a myth that Nasri can play successfully as a playmaker. At least so far.