Guy Pearce question

LaceSensor
MemberOvomorphDecember 20, 20111011 Views10 RepliesHi,
Been a looong time lurker here.
Based on the poster, Guy Pearce is credited after Noomi Rapace and Michael Fassbender.
I wasnt expecting that, I assumed he was a bit part, or as some has suggested the model for the big head in the film (perhaps just a giant - pun intended - coincidence).
However, his high billing in the credits make me really ponder about him.
Perhaps, if the theory of the Space Jockeys creating man, and populating /terraforming Earth are true, then Guy Pearce is some kinda "Adam" character.
The other postulation is that the robot David character is somehow a precursor for human life and/or he is changed from Robot to Humanoid / Biomechanical Human / or just straight human in the film. Perhaps he changes into the facial features of Guy Pearce?
I dunno. These are some crap hypothesis by me for sure.
I just cant find or have missed the credited character for Guy Pearce or anything else to explain what he is doing in the movie.
Your thoughts?