It's unfair I think to put any blame on the CB selection because Kev, Bernardo, Haaland and Foden didn't play well either, should we have not played them either?
The mistake for their first goal also came from Gvardiol who has been fantastic recently and he still actually had a good game otherwise so it's difficult to really put blame on anyone.
Either way we could of got the goal and we missed a ton of chances. United came with a gameplan and they outran us in the first half which just about paid off, that's the only difference really.