He keeps talking about maintaining possession when asked about the reason for lining up all of Iniesta, Fàbregas and Xavi, yet statistics actually refute that argument and today's game again showcased that not only do we have more control of the game without Fàbregas playing, but we also make quicker transitions. Besides that, Neymar and Iniesta are much better in their actual positions than in the ones they've been occupying these past few games. I assume the reason he went with this formation is that he just saw the team playing well in those games and thought they would continue like this if he didn't change anything. I might be a bit harsh on him but that kind of coaching leads me to think that he just doesn't understand tactics the way other managers do or, worse, that he doesn't have the courage to change things.
I remember that we had a very similar situation with Tito last season and after one great game with the usual 4-3-3 (against Milan), Iniesta never played on the wing again. We might witness something alike in the next few matches.