An important finding here?

Oh i have a theory that explains these things... 1) Dead Jockies 2) Derelict on LV426 being parked. 3) The Mural 3) The Eggs in Alien. I can go in depth but in a nutshell here it goes.... Engineers either have a Technology that can Bio Form Organisms (create new life, or modify old). Or they Stole or gained it from somewhere else. We know some Organism/Bio Forming substance has effected and mutated the crew, and caused Shaws Baby... What if this Organism or Bio Former is either a creation of the SJ, the Stuff that Bio Forms life or maybe indigenous lifeform? Maybe the SJ had in past be that by accident or on purpose using their/stolen Bio Forming Agent/Organism created some kind of Organism that turned out bad. We know what happens to the Human Crew, maybe before they got there what ever caused them to mutate has before created something else. some SJ experiment may had created the Xeno, got out of hand and killed off all the SJ well most of them. somehow the threat had been taken care of? But as part of the clean up process the remaining Jockeys realise what they created was uncontrollable, and so they shipped whats left onto LV426. Why could they not wipe it out instead? Maybe they created a Bio Weapon that went on the lose, or maybe a accidental experiment with results that created a Organism that once they put a stop to it, then thought best keep some of it as it could come in handy as a Weapon at some point, but we cant keep it here so send it to LV426. Thus the Derelict in Alien was shipping the remainder of the Eggs to a safe place, as Xenos cant go and fly ships can they. But something happened to the Jockey? Or he sacreficed himself? And thus put out the warning becon to warn the other Jockeys ON LV223 that again the Organism has been compremised. This would explain the dead Jockeys, it would explain the Derelict parked on LV426 and also would also explain why we will not see NO XENOS in this movie untill maybe the End? Maybe not all the above is correct, maybe none of it is close, maybe some is? Maybe the Xenos nearly wipped them all out, so they stored them on LV426 and the Derelict was going to LV426 to load up on Cargo of Bio Weapons. To deal with the Humans who now knew how to find their homeworld and found out about the SJ Bio Forming Technology. Who knows?

Maybe they are other space travelers, creations evolved on other planets, having themselves achieved space travel and singularity, that arrived in the past, looking for their own creator because of signs left on their own world. Every time one shows up a chain of events takes place, still a mystery, that basically kills them all AND destroys the planet they came from. For some reason. But then, where are the other spaceships?

Ummm....this is possibly explained in the "leaked" script that can be found with a little digging. The more I read, the more that script is being validated...I'd say it's a bio-suit the SJ wear and they are hunched over the "helmet".

@BigDave and Jergeronimo and Necrofan and Tokyokid and Gem]n[ and Artyoh... thanks for your input guys...I liked BigDave's idea of self sacrifice of the Sj...maybe knowing he was infested , he drove the LV426 derelict there to save his race from xenos. I also liked Jergeronimo's idea...the sj suit a nurturing facility? the proto-form of a new sj the squid? then developing into a full body sj within this cocooning suit?