Fair 'nuff! XD For what it's worth I have 100% predicted stuff incorrectly before haha. I was very, very doubtful that a more beast race aesthetic would be playable (let alone as cat people) but lo and behold it happened. Win some, lose some.At the end of the day we can all only theorize as best we can given info available and see how things develop.
I'm a little unsure on the overlord situation in part because at a certain point in soul division and amnesia idek what that process would look like. And I mean Elidibus is also under significant pressure.
But omg, idk that it would happen but it would be wild plot-wise if we found amnesiac reincarnated Lahabrea or Emet-Selch then had to play keep-away with Elidibus trying to rejoin them. I respect your skepticism, but I'm so unspeakably suspicious of Emet-Selch's clone horde lol.
And you're right on us not really knowing if the souls still exist or what state they'd be in! The difference between souls and aether is also something that seems a little ambiguous rn. Thordan said one thing, lore on Pixies and the Undead says another, the situation with Haurchefant and Ysayle says another... there's a lot of ??? going on.
I personally am not into soul destruction as a concept on many, many fronts--some just reflecting my own spiritual beliefs. Overall though the idea of that happening especially with recent revelations would leave a bad taste in my mouth. It's a level of crushing hopelessness and mercilessness on a massive scale that imo would feel inconsistent with the game overall. It also strikes me as lacking closure in many ways.
Again, I could end up wrong and just not liking the outcome. But got my theory for now and near as I can tell (especially with the lyrics for Tomorrow and Tomorrow) there's a reasonable possibility there. There's reasonable possibility for loads of stuff haha. Just gotta wait and see.