Ok, you guys have helped me figure something out. I read somewhere that Anderson stole 40 pages of the original Alien script and turned it into AvP. Obviously, that's where he got the pyramid idea. And about the Derelict. I personally agree with Praetorian's theory on this site's Alien/AvP info that the Jockeys were slaves to the predators and they transported alien eggs across the galaxy. The ship was hit with a meteor, it crashed, and there ya go.