Random Theories

Hi, new to this, hopefully nobody has posted this before. I kinda waffle with this. What if the end of Alien ties into the START of the film and not the end? Say the film starts with the Sacrifice Engineer, we dont know what is really happening apart from creating life. Rest of film progresses until near the end. What really happened: One or more rogue Engineers accidently create Xeno through DNA tampering outwith what the Engineers usually / allowed to do. One gets left on LV-426 to die by his own creation. Others decide to strand the Sacrifice Engineer on a different deoslate planet for his crimes. The Engineer race key to creating life is their own blood. Life created depends on type of conditions. Sacrifice Engineer knows he's stranded for life, decides to sacrifice himself in knowing he will create life which will evolve into a dangerous form (us) that will eventually wipe them out, meaning he gets revenge. Takes a while to evolve as his blood is dispersed by waterfall / river, resulting life is takes a while to evolve. In Prometheus the black goo is Engineers blood, it forms in a concentrated area through human tampering and creates something more unstable and agressive in shorter timeframe. Cue horror of rest of film but at the end see we were actually the tool of revenge. At the end we see everything that happened on LV-426. Ridley said the Engineer from Alien could be millions of years old. This might tie in.