I think our main issue was that he did compromise at Anfield and then he had to change the other way because we were 3 down.
I think the problem was the compromise was the wrong compromise; the wrong players (Laporte, Gundogan) added in positions that they are not familiar with and do not excel for a key away game. Peps tactics at the Eitihad were askew and smacked of desperation and bad judgement; we needed a solid defence to keep a clean sheet more that we needed a blitz attack.
We need a solid defence and a consistent defence, Otamendi has been awesome this season in the main but when the chips are down he is down on the ground with a failed last moment desperation tackle that does not win the ball. Vinny is a legend, but past his sell by date. we need a solid twosome at the back and less rotation of full backs.