So after reading the myth of creation according to the Sumerians where a god is sacrificed and his blood is united with clay to create mankind. It was impossible to me, to not think in parallels. Yes the engineers sacrifice one of their own and yes he drinks the goo to make us. That would make the goo equal the clay. So if the clay is our shape and the blood the blueprint to make a human, this means the goo can be seen as animated and melted flesh?
Looks like that episode of doctor who where the flesh has a mind of it's own, but it does look like it. When in contact with the goo, the flesh is destroyed and only the DNA remains(the blueprint), but where does all that flesh, muscle and organs go? That's what the goo is. It just needs our DNA (our blueprint) to do the rest and create a being.
Another thing to keep in mind: bones. That engineer leaves us to evolve during the course of years to create a complex being. But mainly every creature in prometheus is invertebrate. From the worms to the trilobite. Ok ,the deacon isn't, but he starts as an embryo. So maybe the result is faster, because they don't need a bone structure, or a complex one at the very least.
That is why the engineers only drank a little of the thing, he was giving aways his own flesh already.
Fiffield is the exception, he already had a bone structure, so he jumped a cycle straight to a grown xeno.
