I think the most likely thing is that Zovaal did the Arbiter's job, and at some point he though "What's the point of all this? Why are we all working on this seemingly endless cycle? Fuck this! I'm stopping this nonsense and build something better myself", creating a rift between Life and Death, and forcing the other Eternals to stop him and imprison him.
About Elune and the Winter Queen at odds, my theory:
- Zovaal did something against Life (probably invaded the realm? maybe he killed someone in the Panteon of Life?)
- Elune is angry with WQ because she thinks that WQ should've stopped Zovaal before that happened.
- WQ is angry with Elune because she couldn't possibly stop Zovaal before, and see's Elune's wrath unjustified.
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I think Titans are not the top notch in Order, and instead, like Old Gods, they are just seed. That's why they're born from seemingly random planets and the others don't know if and where there are other Titans.
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There's a diary in-game from one Archeologist Broker talking about the 6 forces in the universe and what appear to be a fractal 7th force over them (hints at the First Ones) and how they replaced him because their compatriots saw him as crazy.
https://ptr.wowhead.com/news/tazaves...-of-the-322938
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Also, if you think about that, it makes sense:
- Order doesn't have actual life, they're all constructs: Titans (they're sort of superior constellars), Constellars, Titan creations, etc. They're all constructs.
- Light seems to be the same, with the N'aaru.
- Void creates life where there isn't with all the "fleshification" that the Old Gods create.
- Fel, while we've only seen the more destructive face of it, it's just pure change. When the Shadowlands rely on the imposed order to work, I can see why it's also bad.