Just watched that first goal back again. My thoughts on it. The goal is caused by people not knowing what they should be doing.
Firstly, Kane can't press Henderson which leaves that donkey with time and space to do what he likes. Aurier clearly says to Rodon to pick up Mane and Rodon doesn't do it. Firstly, Serge shouldn't hand him off because the man wide on the left that Serge is going to take is no threat, Bergwijn can cover him and the ball is never going in the direction that Serge is covering. Rodon should do better to pick up Mane's run. He got the shout. For me, I don't blame Dier, he plays that ball and he massively risks an own goal. Hugo can see in front of him, he can use his hands and the ball is close. He should take it. Davies as well is at fault for not stepping up.
So you have Serge making a bad decision, Rodon not taking Mane, Hugo and Dier getting mixed up and Davies playing them onside. It all points to me to a defensive unit that doesn't know what they are doing in an unfamiliar system that's never been played before with those players. There's one man that should take most responsibility for that and he wasn't any of the ones on the pitch.