Cech was at fault for the third goal, but so was the entire defensive unit. I can see no blame to him for the other two.
Indeed, we didn't open them up often. We lacked a player with a range of insightful passing.
As for Xhaka, we were clearly going to be facing pace. Monreal or AMN would have given us a better option. Xhaka has never looked remotely comfortable against quality at CB and was always going to be roasted if they won possession.