I think Carlo will use his CB pieces as he sees fit from game to game.
Godfrey will play. Carlo will probably insert him for the first time when a current CB plays poorly, and then use the competition for places as a goad to demand performance. If he gets a rotation that he feels "works", he's likely to stick with it until someone has a poor match, then insert the combination he feels works best for the next fixture, and iterate.
Yeah agree with this broadly. I think for most games Carlo will mix up his defenders playing one of Keane/Mina alongside one of Holgate/Godfrey. Occasionally he may decide to play Keane alongside Mina if he wants to defend deep (thinking RS and City and maybe Leicester with Vardey) and Holgate alongside Godfrey if we want to play a high line against a counter attacking side.
Personally feel there are no stand outs amongst the 4, I like all of them and am happy to have them. Whoever is in the team will keep their place until form or injury requires a change, then it's up to the new incumbent to step up and keep his place. Competition is the name of the game.
I think our back 4 could be settled for some time. They are all of a decent age, have a good cross section of qualities and attributes, and one of our two younger boys will add cover and left foot versatility to the squad which we will need if we get regular European football.