Engineers - Xenomorph relationship

Hello all, I've just seen Prometheus, gave it some thoughts. I would like to share my own theory for the backstory. (sorry for the long read but a lot of details seem to work, at least to me) The Engineers and the original Xenomorphs are a single species, they are neither male nor female, having a very unique life cycle. After some maturation, the animal-like Xenomorphs turn into Engineers. In fact, the mural depicts this final chrysalis. It might also be that the space-jokey suits are made from the hardened remains of the shell they emerge from. The engineers are wise and they don't age. However, in order to reproduce, one must sacrifice himself to a face-hugger. Understandably, this is a source of tension and acrimonious debate among an otherwise eternal species. They perform some genetic experiments, hoping to find a way to make copies of themselves that involves a lot less dying. Mankind is one of these experiments. We are smaller replicas of the Engineers with the reproductive capacities of Xenomorphs, explaining the obvious similarities between human genitalia and Xenomorph anatomy. This makes us mortals, our reproductive power coming at the cost of eternal youth. Unfortunately, we are also subject to Xenomorph-like aggression. This mix of inventiveness and aggression makes us a very real danger at the cosmic scale. The reality is that mankind is the #1 danger for life across the known universe. After some time watching us, the Engineers start working on a doomsday device meant to wipe us out. This is the black ooze, made from several strands of DNA, meant to be sterile but proving deadly by invading hosts and mutating them rapidly until a quick death is reached. Possibly, the opening sequence shows us the inventor of mankind, condemned by his peers to commit suicide, much like Socrates, but by drinking the ooze instead of the hemlock. If Hollywood Sci-Fi has taught us anything, it's that genetic research always go bad. It went bad with mankind, it went bad with the ooze. Somehow, an accident occurred and the plan to wipe out mankind could never be carried out. Two millennia later, those destructive humans show up. Exactly what we feared. The black ooze, through rapid contacts (ooze to male, male to female), regains its reproductive power, giving birth to a shapeless mutant queen. By later invading an Engineer, this gives rise to a new Xenomorph, filled with energetic agressiveness of mankind and the pure evil of the ooze. Later, an Engineer will complete his life cycle and offer himself as host to a facehugger, only to realize that he's been impregnated by a this mutant Xenomorph. Out of options and short on time, he intentionally crashes his ship on a nearby, dead planet before the hatchling is ready to burst out. Unfortunately more humans will show up, some 50 years later, on the Nostromo. ***** I couldn't help but share my thoughts. Frankly I hope that this was entertaining more than I hope to be right. Regards,