So a random Epileptic Tree that came up on Discord:
This was Chaos Quest all along. The details were there but we never saw them.
First. Tzeentch.
Tranth. Tormod. Turoq. T.
Tranth constantly brings hope by inventing new stuff, which also an aspect of change. His lucridous success rate is easily put down to daemonic sorcery help - Did you really think upgrading ancient technology in a decade or so is a thing that happens in WH40k? Nope, didn't think so.
Tormod. All his luck is a remarkable major blessing by Tzeentch, so blindingly obvious. Next.
Hell, look at Surt - Or should I say, Trus? He pulled a a Vlad by flipping his name (Gods this is a major recurring theme). Look at how he bamboozled the Council into thinking he was incompetent random warrior when he actually has awesomegrade stats across the board!
Did you really think Jane killed the Changeling? What's more likely: She did, or the Changeling did so and replaced her, before proceeding to ram that massive lie through the proverbial gates of disbelief? After Changeling defeated Jane, it just spun a tale about how it was itself defeated. And we all bought it.
/
Next. Nurgle. Holy number 7.
Rotbart.
Rot-Bart. Rot. ROT. It's even in the name, holy crap. There's even a medical issue called 'Bart Syndrome'. We just need to eye Skewfiend again as to how he managed to push this through along with Dalv=Vlad revelation. Rotbart even has 7 letters in it - Nurgle's holy number. And what else has 7 letters in it? Avernus. Helheim. Both names for the planet. Both 7 letters.
It is no coincidence that Rotbart could flourish as a general here, and what is in truth a Nurgle Daemon World. And it is also no surprise there were so many plague outbreaks among the population, or how Nurgle is one of the top contenders of Chaos worship on Avernus. And it is no surprise again when Rotbart and Tormod have their great conflict with how Tormod should be the next governor - Being Tzeentchian, Tormod utterly disliked Rotbart. Being a Nurglite, Rotbart unconditionally loved his son. Nurgle had the domain of familial love, after all.
And all the cultists we catch on Avernus? Who's to say they were just executed? The Changeling, in disguise as Jane, has been secretly trying to overthrow Rotbart for centuries now. Ever notice how we have yet to have a Nurgle or Tzeentch Daemonic Incursion? No? The planet is in a constant, massive duel between Nurgle and Tzeentch! The other incursions are just sideshows. We just never notice the eternal duel between them.
Do you think Turoq's attack on the Trust was a coincidence? Tzeentch vs Nurgle. No coincidences.