Linking "Prometheus" to "Alien"

Rating: 10/10 (13 June 2012)

Warning: lots of spoilers and lots of speculation. By now I'm assuming you've read the summary so I'm not going to waste your time with another log-line. After racking my brain, here is my theory behind the science of "Prometheus" and exactly how this film is linked to the "Alien" universe. The film opens with a Mala'kak standing in front of a river, who we are told is an ancestor of humanoids, and some theorize, it committs ritual suicide by ingesting black liquid, which is actually the same liquid found in bomb like canisters manafacturered by the Mala'kak people. Once the Mala'kak drinks the liquid, this causes its body to disintegrate. Upon disintegration, its ashes fall into a riverbank and we witness its DNA deconstruct and give birth to a new strand of DNA.
My question is why if designed as a key ingredient to such a deadly weapon, would this be the same ingredient used to create human life? Now, we have to assume because a rescue beacon was present in the crashed Mala'kak ship found on LV-426 in "Alien", there is a rescue beacon present on the downed ship on LV-223. It's this distress signal from the downed Mala'kak ship on planet LV-223 (after Shaw and David launch), which eventually summons a Mala'kak rescue mission. Once touching ground on LV- 223, the rescue team encounters a hive of face-hugger's given birth to by the alien Xenomorph spawned from Shaw. The rescue team of Mala'kak make their escape, but not before the captain is attacked by a face-hugger and infected by the creature, eventually resulting in a "chest-bursting" episode. Unknowing the pilot is infected, they successfully take off from LV-223 (again, just my theory).
To further my theory, once the team of Mala'kak escapes from planet LV-223, the captain most likely begins to feel the monster from within and they are forced to crash-land on the closest planet: LV-426. This, resulting in the famous "space-jockey" chest-bursting image as seen in "Alien", further explaining the alien Xenomorph discovery on LV-426. Yes, Dallas believed the Mala'kak was fossilized, however, this is an impossible assessment due to the fact the Mala'kak on LV-426 was discovered in its space suit. This is just my theory anyway, but of course the sequel (if made) should have all of the answers, some possibly very different from the ones I arrived at.