Genuine serious question: how does David Luiz not fit Jose's system? I mean, i get that Mata didn't have the physical attributes and wasn't nearly comfortable enough with his back to goal to play the number ten role in Jose's system and that he lacked the pace and stamina to play on the wings. But what exactly does Luiz lack to play the CB role in Jose's system or how does his style conflict with this system? Till now, the claims that Luiz does not fit Jose's system are baseless because no one, to my knowledge, has given a convincing reason why.