Whoever the players are won't matter because of what we come up against 90% of the time. Eibar just won't attack us to make the double pivot worth it so we may as well just stick in Munir for that game as another striker. If we have to have 6 'defensive' players against teams like Eibar then I really worry about our defence in general.
realistically we'll have 3 defensive players + Busi in that formation which is more than our 2 CBs + Busi while Alba and Cuadrado can join Rakitic, Iniesta, Messi, Neymar in attack easily enough also Busi can drop into the Xavi role going more forward than usual with Mascherano there to cover for him. Also keep in mind that we are attacked 4-5 time in a game and because of too much space left behind we concede from those few attacks adding Masch into the mix with Busi makes us 100x more defensively sound while giving up very little in attack