One other thing I've noted for GO that is something of a positive and a negative:
He hasn't fucked around with round pegs in square holes; he could easily have shunted Lemina into the back 5 rather than playing Toti. Toti, being the gangly son of a bitch that he is, doesn't always look convincing but he mostly does the simple things well and never seems to "switch off", and often that's enough.
The downside is that it's clear GO recognizes that CB is our biggest weakness, and so playing with 3 is a case more of making sure all of them have cover at any given time; there's not much in the way of allowing someone like Kilman to step forward to take at least a little bit of the work away from JG and Lemina, who are still being asked to cover an enormous amount of ground as a pair. Having the third CB makes us less susceptible when João and Mario do clear the center of the pitch, but it also means that when we turn them over high up the pitch, we still find ourselves with voids of unexploited danger areas.
It's a pragmatic way to go about things but I think he's picked the correct risk factors to mitigate, at least for now.