Possible Explanation?

Hello, been lurking on here for a very long time, love the discussions! Anyways, here's my thoughts on some of the crews demise, and pardon if some have been thought of/discussed...tried the search function and couldn't find these. Milburn- Cobra get's him. However, things may have a longer lapse. It gets in his suit, then enters his mouth (or, just put's its "head" in his mouth and depsoits something?). Now in th trailer and stills, his helmet is on. When we see dead Milburn and the cobra (or other creature) ejecting, his helmet already has a hole busted in it. Possibly, after "laying" another organism in him, the cobra ejects. Or, someone busts a hole in it to try and remove the cobra (my guessing Fifield). If that's the case, while trying to remove the cobra, Fifield is sprayed causing the face melt. Fifield- As stated above, the face melt. I believe he is the one they drag back to the ship and he's the one in the previews who stand up to the merc. Incinerated after killing the mercs (and maybe Chance or Ravel or both) in the Hanger. Ford- Cobra does NOT get her. It merely jumps past her. The remaining Jockey that awakens gets her after "mind paralyzing" her. Holloway- I'm going on a limb. The large tenticle in the previews...is him in his final transformed stage. I don't believe he "becomes" a Jockey, or the blue guy. Jockey's are the worker bees...the blue guy is the leader. Thoughts? And I know, I'm probably crazy with some of these. Can't wait for the movie!!!