Sane was superb last night. His defensive work was fantastic and he bollocks the others for their mistakes. He takes it to the opposition and when he'd had enough of being wrestled by their full back with no action from the ref, he took matters into his own hands. He played a great second half. He'll be a monster if he can hit the target more and stop putting corners out. Him and Fernandinho are the keys to Guardiola's system because they've got the dynamism that most of the others don't have. No accident that those two have had four penalties turned down and one given in the last two games. Sane fixes the defence in place by staying out wide and gives the others freedom, and Fernandinho's versatility allows for changes in personnel and formation. His versatility owes as much to his energy, aggression and speed as it does to his technique.