[Spoiler] 'The Beast that Mourned'

[Kallera]

The process of summoning a primal, and creating one are two separate things.

as for Greg, well, I don't know if he truly enters into the scheme of things other than "Hildebrand's kooky adventures." but he did know of Enkidu as a being before running into the green chicken who he named "Enkidu".

[Lokier]

Tsbnip.

I say bird because I don't know what they actually are... I'm sure FFXIv has like 50 names for them throughout the game like they do with every monster in this game, lmao.

I don't think Ekindu was any kind of god though, if you've done the new Xelphatol dungeon you'll have found a bunch of them trying to blow you up, so they don't seem to be any sort of godly being or anything, just birds.