Exoskeletons

OK, so as far as I can tell, Weyland has an exo-skeleton to assist with his movement when he is in the suit in the loading bay. Perhaps the SJ's suits offer a similar purpose, hence that's why they are much bigger suited as opposed to their usual self. thus explaining the disparity in sizes from what we assume and actually see the SJ as in the recent clips. Maybe this bio-tech in it's most rudimentary form for Weyland plays a part later on?