So you mean to say KdB isn't objectively a better attacker than either of Xavi or Iniesta?
I'm not really someone who pulls in stats to justify my point. But might as well do that for this particular instance. Go and compare KdB's G/A with that of both Xavi and Iniesta. It's not even the G/A - it's the quality of the opponents that KdB has put up those numbers.
He doesn't play against the likes of Mallorca, Almeria, Osasuna, Gijon, Zaragoza week in week out. He bosses the games against the likes of Liverpool, Chelsea, Utd, Spurs, Newcastle etc.
I expect you to know better than me - since you have seen KdB's performance against your club - season in season out.