Who is inside the suit?

Hi all, well, I do not know if this has already been discussed but I've noticed some differences between the Space Jockey Pometheus and the original Alien. [img]http://i1173.photobucket.com/albums/r584/Korn1986/spacejockey2.png[/img] 1) We can see that in the original 1979 version head rises above the start of the chair (see red line). On the other hand we can also note that the shoulder of the SJ is at the same level of the beginning of the chair (green line). And notice in the arms, are really huge. [img]http://i1173.photobucket.com/albums/r584/Korn1986/SpaceJockey.png[/img] 2) In the new version we see a creature much smaller with much shorter arms. I'm not sure, but I think the Prometheus suit may be in use by some human or android (¿Shaw or David?) Another possibility is that the tall guy is not as big as we have been thinking, you may just be a mutated human. I'm beginning to believe that the SJ Allen is a true giant, instead what we see in the trailer is just a human being. Now what are your thoughts on this?