3 at the back is the only system that integrates Aguero, Jesus, Sane, Sterling and de Bruyne. Mangala is a very good defender, Denayer as well, and you judge Adarabioyo after one game? And Moses is not a monster of a wb. Sterling is 3xtimes the player Moses is.
"Mangala is a very good defender" - Yes,very good defender for a mid table PL side, not for one who aspires to dominate Europe.
And I am not judging Adarabioyo after one game. But if he was ready to be our starter, he would've already been given more chance in our current side.
Yes Moses is a monster physically, and that's the most important thing to be a wing back, also he is actually very good defensively unlike Raheem, who shouldn't even be discussed to play a role which he has never played in his life before. What makes you think that we'll go through whole of the next season with just Raheem and Leroy as wingbacks, without any backup. Plus why change the system they are flourishing in? Just to accommodate 2 strikers, you are suggesting to change Raz's and Leroy's positions even though they are actually flourishing. That logic doesn't make any sense.