Winter even clarified this point in his press conference after the Colorado game when asked about the formation, for what it's worth. All that has changed recently is a move away from usually using a 4-2-1-3 point forward over to using 4-1-2-3 point back now there's a player (i.e. Frings) available to make it work. With better central defenders we'd be seeing Frings pushing further forward more.