Blue guy is Fifield.... i think?

i know this has probably been talked about, but i still think it needs to be looked into much more closely.... after watching all the trailers i would say that after Fifield turns into the mutant guy, he turns into the blue guy, i only assume this because of some of the shots in the trailers, the most credible shots of all that point to this (i forget what trailers they are from) are the one of the blue guy standing over Shaw and the shot of Shaw screaming with the back of somethings head in the foreground, just by looking at the background and the fact that Shaw is wearing a space suit in both shots, i would say this is the same scene, and in the shot of it standing over her, just by looking at the body it is very clear that it is the blue guy, and in the other shot it is very clear that the head is burnt and textured much like the mutant guy, so assuming we just haven't had a really good shot of the head texture of the blue guy, they could very easily be the same thing. what do you think? also, if you think that this HAS been talked about enough then please send me the link before locking this thread, thank you :)