Halo 4 Juggernaut/zombie idea

It’d be cool in Halo 4 if you could play as a class 12 Forerunnner, or whatever is really high. But only in juggernaut. The juggernaut is a forerunner while the regular humans are Spartan IIs. That, or in zombies, the zombies are SII’s and the humans have forerunner armor.