AI Goo

I've wondered about that for awhile, so have others on this forum. Here's one thread I could find from 2012: black goo and david

The end of the video made a lot of sense from Ridley's point of view of beginning the prequel with the Engineer sacrificing to create life and the ending of the prequels with an android sacrificing himself to create life. 

The Goo has indeed evolved over the course of its time, from what it was implied as in Jon Spaights work, which is a Pathogen/Substance that allows for Genetic Splicing/Hybridizing and seeding of DNA

The AI element to it could be interesting as it means it can be programed to alter how it effects subjects.. i think this was brought in to allow for and explain why the Black Goo reacted differently in Alien Covenant