The caballero decision is something I will never understand. As for Kolarov, I think he has worked with Guardiola from the very start of the preseason and the manager believes and trust's him to follow his instructions and lead from the back, how that plays out in a high tempo, pacey premier league match remains to be seen. This team will defend by keeping possession and as long as we do that, then the worries at the back may be papered over. In this type of game, the impetus will be on offense and doing things on the ball.