Rio is an excellent reader of the game. He's not the type to go diving in and throwing his body infront of everything. He's more of a right place right time defender. Very tactically astute. The mental side of his game is much more prominent than the physical side. I don't think that is such an outrageous opinion. I don't remember saying Vidic is "daft" either, but he's certainly more of a gung-ho stopper who will throw his body infront of shots, make the last ditch challenge - cynical or otherwise - and stick his head into awkward aerial challenges, as does Luiz, or Puyol. I'm not saying that's all there is to his game, but he boasts more physicality than Rio does, in my opinion of course. Feel free to correct me where you think I may be wrong.