As an extinct race the Space Jockeys can answer many questions regarding the Aliens. They don't need to be alive for this. All you need is another derilect ship (or the same one on LV-426) to add just a little more insight into the xenomorphs. In Alien, the original astronauts that board the ship openly wonder what happened to the rest of the crew. Just to see a few more chambers of the ship and the remains of one or two more fossils would be interesting.
I admire the fact that Sega went as far as to hire a team of well-established writers for this game. It shows that they are, at least, relatively serious about doing this right. If, in fact, players of A:CM do make it down to the derilect again it would be an added bonus if H.R. Giger contributed to the design of anything new (but I guess you can't have everything). The last thing he ever did with the series was draw the original sketches of the Dog Alien from the third film. If a chestburster did come out of that fossilized Space Jockey, I'd like to see what that xenomorph looked like...fossilized or not.
