Official 720p Trailer - Slowed down 90%

The "engineer's" seems to be biomechanoid in form, as we see with the dude standing as the chair rises from the platform...where I am getting at is that their bodies connect with the suit biologically like a symbiotic suit....would explain the weird markings on his body...

He's jacked in.

looks like the guy in pain with acid in his face or maybe mutating could be Holloway. His name on his forehead resembles something like it