The problem with Citeh is going to be injuries. Really what happened at Bayern too.
I'm obviously not one of those people who poke holes in Pep's tactics and success, I think he's been about as grassroots and perfect as a manager can be, ever, but he was absolutely blessed that he never had to deal with a lot of injuries during his Barcelona tenure. Messi's initial injury that took him down from TITAN status to a mere god happened the year Villanova took over and Barca has never really been the same.
See, pundits get so wrapped up in "Pep's game", they ignore that he can shape formations and tactics around players. Yes, he needs and desires specific player, but you notice how different City play when Bernardo is the only Silva on the pitch. Things get wider, meaner, and imo more aggressive and efficient (no hate to D.Silva, who is in fine form), but for some reason that doesn't seem to be sustainable over a few games.
In Jan City are bound to have a big injury. I feel it coming. That's where I think Liverpool pounce and start picking up those sloppy 4-3 wins while City sees more 1-1 draws. It's gonna be a war of attrition and I think Klopp has the blessing and curse of a more open playbook. I think this Pool team would play the same type of football if you changed 5-6 players from the starting 11. Can we say that about City?