The thing is, Pep knows that Kolarov isn't a cb, but he's up to something. There are a whole bunch of players who could have played there instead of Kolarov, even with the current injuries etc, who would be better at cb.
There is a reason Guardiola has been using Kolarov. Whether it's because he's teaching him something & sees more to him than we do, or he's teaching the others something or if it's just to keep the team under pressure to teach them to cover, it's not because Pep is either a fucking idiot, or has no other choice, as seems to be the suggestion by at least half the flappers on here.
He didn't have to use Kolarov & Fernando at cb, he is experimenting with something. I can't fucking stand Kolarov, but I know Pep Guardiola knows his fucking stuff, so if he wants to try something with Kolarov, he can jolly well do so.