I was transcending the mere hypothesis of Engineer in the first place.
I'm sure "Engineers" doesn't exist literally in the Alien verse, Ridley's seems to have more obscur motive.
i.e. why I said they weren't engineers because I don't believe it's really a "specie" but more one of diverse humanoid category regrouped created by higher being.
Which is why we have humans, the one doode covered in giger genetic modification on LV-223, the greek god at the opening of Prometheus and now these things on Covenant. All humanoid, all likely derivated and seeding worlds but not specifically the origin of life itself nor the answer to the question of the black goo/Alien.
Still, all this sounds like a weak fan fiction that I barely find interesting. Why not? But beside that, which I don't care much, I'm more worried about the actual film itself and the logic that's behind. If only the editing could not suck like prometheus at least
But of course everything there with the film still being worked on is at the hypothesis level.