Xenomorph points of origin

This is |from| a reply to a comment under one of the more gruesome Alien/xenomorph expanded universe narratives.

As far as I've gathered, David learned of the xenomorph from one of the murals.

My best theory is, that the Engineers had captured a presumably xenomorph specimen in order to study it, and kept the xenomorph in stasis, appearing to the uninitiated as part of the mural.

Thence, if not that the outline of the specimen was in stasis, David seems to have become aware of xenomorphs, and seeks to recreate them from the outset; thinking maybe, that the black goo was extracted _from_ xenomorphs.

Thus it's not wrong for Ridley Scott to say, that 'David created the xenomorph.' It's only, that the wayward synthetic finalised this particular version of the species, per information he could gather from the black goo during his interaction with the Engineer ship and subsequent stay on "Paradise".

It could be a plausible claim, that the black goo that we know, was perhaps developed by the Engineers on LV-223 through the xenomorph specimen kept captured in the mural.

I actually like to think, that the black goo is of a different source, which the Engineers may simply have stumbled on. I think there's a hint to that in "Prometheus".

The conclusion of all this, is, that both the point of origin for the black goo and the xenomorph species should be much earlier than the "Prometheus" and "'Covenant" films would make us believe.