Creation revisited

I must say I got inspired by a previous thread read here by the title "Beginning of Time Sequence". That's what I wrote there: I 'de like to go deeper! The creature with the goo running through its body, in the waterfall scene looking at its hand is no indigenous primate...well not anymore in the best case... Maybe it is a crew member of the saucer, an Engineer....maybe used to be an indigenous primate of the planet, perhaps the most developed in terms of DNA, but now changed by the goo into a totally functional being from the saucer...an Engineer...With the goo, their entire race can keep on living forever by vistiting other developed planets, choosing primates as vessels for the continuation of their lives or living an Engineer on each planet to control evolution....now how's that?So, the saucer is programmed by their superior technology to carry somehow their entire race, packed in DNA containers, and applying the mix to primates of each planet, thus preserving the Engineers race immortality...That would explain the pictograms of people worshiping the Engineer. That guy in the waterfall resembles the begining of lets say intelligent life in every planet. I don't believe they create humans. There is something much more devious. For one they have to sacrifice (perhaps) a primate human, to become the first Engineer vessel. Two, they nurture and give intelligent thinking by manipulating their DNA to the indigenous population, so at some point they can go and find their "forefathers" (as they would think them of) and trick them into a new trap to preserve even easier their space jockey race. At the time of the visit, the advanced DNA that these visiting humans are carrying, is perfectly compatible for the revival of the rest of the Engineers.Now they know the DNA of human on all Earth is perfect...and the derelict begins its journey to Earth to assimilate and turn the entire Earth population into fully grown Engineers....nasty huh...Now you are going to ask..what about the waterfall Engineer? since DNA on Earth wasn't ready for perfect mix, how did he got mixed up with a primate human? Well...maybe there is no other Engineer and no other creatures. The last true Engineer was this guy and did everything he could to preserve the continuation of his race...Once he found compatibility of human DNA that still had to evovle to become perfect he executed his plan and then set of to set the trap on LV.Another theory could be that one Engineer would be left to guide evolution to all other planets with residents with compatible DNA. They would do the same. That would also explain the saying: I King has hie reign and then he dies...its inevitable. So they are not Gods. They are trying to remain immortal. Mr. Weyland understand that and as a man of passions, decides to steal this secret. Sends the mission, and we can all figure out what comes next....mind boggling ain't it?