I had an epiphany while watching Alien

So lets pretend for a moment that we take Ridley on his word, and the planet the Juggernaut is crashing on in the trailers is indeed LV-223, and NOT LV-426. I will then assume that the Juggernaut is not the Derelict, and was NOT piloted by the Jockey getting into the chair that is shown in those same previews. While watching Alien last night, I studied the Jockey on the derelict, and I am inclined to feel like, much as some of you have already argued, that the Alien Jockey's arms are just too long to be chalked up to creative license. This could all be negated if, in that actual film, we see additional bio-mechanical armor rise from the chair to attach to his arm, but I'm not thinking so. My epiphany was this: the mohawk guy who seems to suddenly feel inclined to grow incredibly oblong features, turn pseudo-blue/grey, and commence mass murder may very well be slowly changing into an Engineer/Jockey, and isn't successfully put down in that fight. Later on, when the crew's focus is on stopping the living Engineer from piloting the Juggernaut off to commit his genocide, the extremely long-armed, now Engineer-ified mohawk guy climbs into a second ship, ultimately dubbed the Derelict, and attempts to carry out the same task. But, being the long armed newborn idiot he is, (or for whatever reason) disturbs the ship's cargo as he lumbers toward the chair, and is facehugged by his own weapon. Also, I've considered the possibility that, though its not a part of Ridley's canon, that the image of what appears to be a Xeno (and I think a queen looking at hips) is indeed rising out of the black primordial liquid...perhaps into existence? Okay forum police: FLAME ON!