Okay, I’ve been talking with some friends about this topic, and I’ve been trying to study the expansion myself to improve my writing, and I’ve come to the conclusion that Xal’Atath wasn’t planned as the main villain of The War Within, and likely took Iridikron’s place.
The expansion is based on the uprising and corruption of the nerubians of Azj Kahet, threatening the Arathi and Earthen of Khaz Algar. But if you think about it carefully, Xal’Atath hasn’t done anything that Iridikron couldn’t do on his own except transform into Drenden to infiltrate. But outside of the introduction, we could remove Xal’Atath from the expansion and it wouldn’t affect the story itself.
The War Within is an underground-themed expansion, perfect for the Earth Incarnate. He could very well have corrupted the nerubians by demonstrating the power of the Dark Heart (which he took in Dragonflight). It’s even a little odd that Princess Ansurek, knowing her mother’s story, would allow herself to be convinced by Xal’atath’s whispers, when it would have been, at least in my opinion, more logical for a being who isn’t part of the void itself to demonstrate to her that she can control that power.
The only thing Xal’atath has really done is attempt to absorb the void’s power from the crystal in Hallowfall, but despite this, she hasn’t succeeded, showing us up until this patch that she isn’t proactive enough to be considered a competent and likable villain.
Aside from that, Iridikron could have done all of the above. She could have used her power to destroy Dalaran. The entire Earthen plot is in line with what Iridikron is seeking: answers from the Titans and their true purpose. The Arathi have recently been introduced with promises of an empire that uses light to fight the darkness, but now with the World Soul Saga, they seem like empty promises since it doesn’t seem like we’ll be seeing such an empire in the near future. In fact, I’d go so far as to say that Avaloren and the Arathi Empire could have been an expansion of Xal’atath and Dimensius.
Also, there’s something that strikes me as quite striking: Xal’Atath focuses on empowering his allies using resources already available, rather than using his void herald powers. I mean, if he has the support of Dimensius and the void in general, having been able to support the champion with great power in Legion, he should be able to utilize much greater powers than those seen (or at least summon important beings like Faceless Ones). I know his power must have been reduced by the end of Legion, but it seems very strange to me that he can’t do anything other than visions). Again, something Iridikron could very well do with the Dark Heart.
The other thing that catches my eye are three cinematics in particular. The first is the one revealed in the expansion. It seems rushed due to changes in plans. Xal’atath doesn’t appear, and instead it’s just Anduin and Thrall talking in Silithus, which, by the way, feels more like they’re talking to us than to each other (Not to mention we only got ONE Harbingers-style cinematic. Lack of time?). And the other two are the Ethereals and Xal’atath getting angry at Gallywix when he tells her she gave the Dark Heart to them. It feels like Xal’atath fulfilled her role as a filler villain for the expansion and was removed from the story to focus on Metzen’s plans after the Undermine patch, since, as we’ve been shown, Xal’atath is completely dependent on the Dark Heart to be a formidable villain.
What do you think? There are probably several counterpoints, and some of the points I make are my own theories, but that’s the feeling I get. Metzen himself also mentioned that when he returned to Blizzard, TWW was practically finished; all that was needed was a few changes for future plans. I’m still waiting to see what the latest patch will be about, as I’m still unsure if we’ll see the Harronir or simply forget about them to focus on Karesh.