I think we can be sure of one thing now, Atomos pops above the aethers, in ARR concepts there was aethers chained down, and being pulled out of the ground. Atomos is a gravity based summon (or mob in this case) so that means one thing.

Atomos is the reason for the Aethers in the concept being pulled from the ground, we could see this in 1.23b.

Just something I thought I would share.