Ok, to clear that up, when I talked about the “Naaru puppet” thing, i really meant that she didn’t have much of a free will of her own anymore, and would follow whatever the Naaru wanted for her. And the most obvious way to use that would not be to use her as ome hero or force against the void, but as a sleeper agent, that will probably stab us in the back in furtherance of Naaru goals. If that’s what you had in mind, we’d be in agreement. I wouldn’t really be impressed by that plot, especially since I don’t think the Forsaken need that kind of hit right now, but it’s doable.
Hm, thinking about it… maybe it would even be kinda cool for the Forsaken, if done right. So she betrays us because of mind control, but we - or more specifically the Forsaken - somehow break her out of it, and “free her” She is now a broken undead survivor of a mind-controlling force that made her do bad things against her will… Where have I heard that before? Considering one of my main criticisms of the idea of Calia as a Forsaken leader was that she hadn’t gone through the Forsaken experience… well, I could maybe work with that.
To assuming her role in Midnight’s plot? It kinda is, though. One chapter into the first book of the trilogy is a bit soon for everything but the wilest speculation.
Sure. But frankly, what we got wasn’t a recognizable continuation of the character Khadgar, it was a new character tacked on the old name. Which worked fine. But if they had taken another mage at his level like Ansirem or Modera for the same role, it would have probably worked just as well, if they were just as likeable. With a forgotten character, no one cares if you basically retcon his personality. So yeah, give us some time away from Calia and you could redefine her at will as well. If you don’t wait… well, you get a Jaina situation.
Okay, I wasn’t really looking for a rephrase of your theory, since I didn’t critique your theory. Just as I wasn’t looking the last time you gave it. 
You really, really want to delve there, hm?
I actually liked the theory that the song wasn’t the worldsoul, but the super Naaru T’uure that later slowed Dimensius in K’aresh, splintering him… And with us having that great naaru-like crystal-thingie in Hallowfall that could probably carry a tune just as well…
That’s not how WoW tells its story. We don’t get to see a cultural shock when Void Elves are introduced, when priests of the Light ally with shadowpriests, or when the Silver Hands suddenly treats Sunwalkers, Blood Knights and Moon Priests as if they were paladins of the church. We get a few character viewpoints at most, and the rest of the world has to be assumed as basically be okay with it, because we certainly won’t see any politicing. We’ll get the viewpoint of the characters that are involved in the plot… and superficially enough, that the playerbase that doesn’t care doesn’t get bored with the drtail. Maybe there’ll be one or three “stay a while and listen”. But that’s it. This isn’t FF14 or something like that.
…because of what you have in the brackets? I mean, I don’t see why we really need more that makes them interesting to us than that we have to stop them, be it by might, magic or diplomacy. Seems more than sufficient to me. For the personal touch, we have characters that have a personal relationship to these powers, without blindly following them, like Alleria and Anduin, who are already in our cadre of Worldsoul Saga protagonists. It doesn’t get more personal, when you include more people with the same conflicts.
Also, they tried making the forces interesting without bringing them to Azeroth. That was Shadowlands. And the fact that it was so removed from Azeroth was a loudly shared point of criticism that supposedly explained why no one cared about what happened there.