Well, they can all swap. Enough gamesHe can but he is an attacking midfielder. Would you say Isco plays the same position as Thiago or Gundoguan? No. And sure he could replace one of those two but that leaves us with Merlin, KDB, Raheem and Isco. One of those four on the bench for every match will leave someone VERY unhappy.
Am I right that he would be cup tied for Champions League matches?