We could but why would we have to? Roberto playing RW is still 4-3-3...but yes, in match that could become 4-4-2 if the result is good and we may need more players in midfield to control the game.
I meant it like this; Bravo; Alves, Pique, Vermaelen, Alba; Rakitič, Busquets, Iniesta; Roberto...