This exactly what happened when in Mancini's last season, swap the grafters for more "refined" players, we have been missing that steal, people who are willing to grab the game by the scruff of the neck and drag the team to the finish line.
You look at some of the players we've had in the title winning seasons who are no longer with us, Nigel de Jong, Micah Richards, Alvaro Negredo, Joleon Lescott, to a lesser extent Javi Garcia who was swapped for Fernando, which is no upgrade as far as I can see.
The players we have at the moment who should be able to do it, Kompany and Zabaleta, haven't performed to their high standards this year.
When we have succeeded in the 4-4-2, we've always had a sitter in midfield and we've also had someone who'd work their knackers off up front.
2011-12 upfront we had Tevez in the run in, helped push us over, in midfield de Jong and Barry were rotated
2013-14 upfront we had Negredo who didn't let the oppo defenders have a second on the ball, in midfield we had Fernandinho who was one of the standout purchases of the season
in the 12/13 season and this season, we had Tevez who didn't look interested as he wanted to leave, Barry was one year older and at least 3 or 4 yards slower, this is season we've have Dzeko, who whilst being good with the ball, wont put a shift in, and in midfield Fernandinho has had no support whatsoever from his midfield partner so it shows we do need at least one ball breaker in the team without him we look one dimensional, predictable and at times lethargic as there is no energy in the team.