Zodiark: Good or evil? thoughts

[HiraishinNoJutsu]

Was rewatching some cutscenes and just thought everyone should remember this line as it might be important in the Future

Venat:
"If Hydaelyn is to stand a chance of opposing Him, I am the only one who might serve as her heart"

As we know primals and creations are effected by the thoughts on has while summoning them. An example of the former; Ga bu's manifestation of Titan being very childlike and the Latter; Emet-Selch's recreation of Hythlodeus being more "sophisticated" as his mind wandered during his creation of Amaurot.

Elidibus being picked as the heart of Zodiark for his child like innocence and sense of morality also implies that "core" of the ancient "Primals" play a large factor in how they act.
(I put quotations around primal as Emet says primals after a fashion meaning that they are similar but not identical to what we know today)

Hydaelyn had a completely unique skill as mentioned above of "enervation" meaning that she was different to Zodiark in some ways

With that information we have two very important questions that must be answered:
-Is the heart of Zodiark and Hydaelyn conscious of what they are doing while in the drivers seat? (Will become important if the sundering is revealed to be intentional cause then we're able to place blame upon Venat since they knew what they were doing. Bonus! Venat willingly drop kicked a child and that's really funny)

-Why did Venat deny her other colleagues when they wanted to become the heart of Hydaelyn? Why did it HAVE to be Venat? What did she have that they didn't?

If the glowing figure/woman on the Endwalker art is indeed Venat it would give us much needed insight because even though Hydaelyn did help us out through the story she has also hasn't kept it 100 with the WoL either and whether you are team Zodiark, Team Hydaelyn, or waiting for more answers you have to concede Emet did a better job laying out his case than Hydaelyn has bothered to.

EDIT: Forgot to mention how did Venat's group get the blue prints to make something highly specialized to stop Zodiark? was one of them apart of the bureau of architects? Did they just reverse engineer hydaelyn from analyzing Zodiark? not sure if it's stated anywhere