3.1 MSQ Reaction [SPOILERS]

[Anonymoose]

Disclaimers:
These are just my current theories and interpretations. They could change quite easily.
I'm not arguing alternative interpretations as wrong - just answering questions about my own (and long before they've been polished).

The key thing here is that Elidibus may have thought he convinced Lahabrea to work with him, reigning him in from being so rash, but I don't really think that was the reality.

I had chalked that up as Elidibus failing to keep him on-mission, hence the foreshadowing earlier where Lahabrea cared more about his plans than Zodiark's will. Kind of a semantic difference, no? Either way, they seemingly worked together for at least long enough to not bother with Omega directly. Elidibus seemed more angry at Lahabrea's arrogance and complacency than his actual attempt to initiate the Eighth rejoining. It was Nabriales he claimed was acting above his station. Rather, he says that the loss of Lahabrea will be felt deeply, since he was an "original" (of our world, touched by Zodiark).

It would also explain why Elidibus would offer Urianger either the knowledge of, or possibly gifting the actual item itself, white auracite, despite seemingly being surprised at Lahabrea's 3.0 plans.

I see the big open door for this interpretation (considering Urianger has been hearing Elidibus out and suddenly found an extra auracite). But, at the same time, I wonder if that is enough evidence to jump to discounting what we've been told (that it Moenbryda's research and she had a a back-up in her personal belongings, which he found after they reclaimed the Rising Stones). Do we have more than that?

I'm also not sure the whole mortal-primal bit was Elidibus' doing, either, at least not with Thordan.

That's just my current theory (hence lots of words like seems).
I'm guessing that they split the work - Elidibus worked on the Echo, Lahabrea worked on the primal merge.
In the "something's up in Ishgard" foreshadow cutscene, they were both standing behind Thordan's throne.

Elidibus clearly doesn't want the Triad awakening via Primals, and what was Thordan doing?

First impressions? Betraying the Ascians in ways Lahabrea - in his arrogance and complacency - did not foresee or account for.
Elidibus seems more ready for the Garleans to be messing with the Triad.
I actually forget if Thordan talked much of the Slumbering Gods directly to Lahabrea.