ah ok, that sounds interesting indeed, something along the line what "the corporation" had in mind with Ripley and Co. in Aliens? - if that is what the other "engineers" tried to do - otherwise maybe they had a "cure" on "Paradise" to destroy/remove the parasite ...

yes, some fine plot ideas - well, time will tell what Scott and his writers have in storage for the sequel ;-)

One thing I forgot to mention, what I found rather peculiar, while watching your edit, the beginning kind of reminded me emotionally to "2001" or "2010" - maybe with some tweaking this could be pulled off in the whole movie ...