Yeah. At this point the manga is separate entirely. All the revealations in the last 2 episodes of the animes[spoilers]alternate world, bringing back the dead, who envy really is, what the gate is and more[/spoilers] have either been very different in the manga or have the feeling that they never will happen.

Mustang is much strong in the manga and he will not give up his ambitions so easily. He is just going to have to play along until an opening presents itself. I can't help but think that he will be written in as an attempted human sacrific and fail. Who knows. The series is pretty unpredictable in its plot twists.