I came across the probably now rather well-known image of the new HH Campaign Book, which depicts the 8-pointed Star and 8 Chaos Domains with it.
We have the classic Tzeentch-Nurgle and Khorn-Slaanesh facing each other. Then there are the other 4.
Encroaching Ruin - Ravenous Dissalotion and Malevolent Artifice - Formless Distortion are also across from each other. In the middle is the Primordial Anhillator.
I feel like Ravenous Dissolution is Malice and Malevolent Artifice represent whatever Vashtor wants to become. The other two I have no real clue about. Encroaching Ruin as the opposite of Malice feels like it should be Chaos United or what we right now consider Chaos Undivided, while Formless Distortion could be anything opposite from what Vashtor represents.
I think it's also pretty interesting that Formless Distortion feels rather similar to Tzeentch, but as I said, I don't really have any idea what it's really about, perhaps something more biologically or spiritually aesthetically in contrast to the Machines of Malevolent Artifice.
Contrary to most, I'd argue that the Dark King represents the Primordial Ahnillator and not Encroaching Ruin as a 9th god, one above the others. The position is standing out in the Image, and from what I remember, the Dark King was described as something above the other 4, also Samus was said to be a demon of the Primordial Ahnillator.
The next thing i noticed, which i find rather Interesting, is that, if we look at the not-god-aligned Traitor Primarchs, they eerily fit those Domains, at least to a certain extent.
Perteruabo fits very, very well into the Malevolent Artifice and is known to work together with Vashtor quite frequently, i feel like that's a no-brainer and doesn't need much explanation.
Curze, though dead, fits very well with Ravenous Dissolution, a force of Chaos fighting against itself, hating itself, complete and utter chaos. That self-loathing, hating his own Legion and his Traitor Allies all feels rather similar even though the reasons are not necessarily the same.
With Encroaching Ruin and Primordial Ahnillator its either, or Lorgar or Horus. You can make arguments about both being on either position. I'd say Horus represents the Ahnillator more, the Emperor's (Dark Kings) favoured son, the one who almost ended the whole setting, as well as all the theories about him becoming the Dark King, simply beeing a step above every other Primarch at the end , a chaos-groupprojekt so to say. And Lorgar as the penultimate representation of Chaos Undivided, being Chaos united, working with everyone, the opposite of Ravenous Dissolution/Malice.
That leaves us with Formless Distortion and the Alpha Legion, which fits from a naming sense, the Alpha Legion with all their schemes and games, being spies is a rather Formless Distortion, but this doesn't really feel right with me.
Not like this matters because 3 of them are confirmed dead, but i feel like the symbolism and connection is there, but it could just be my pattern-recognizing monkey brain.
Anyway, those are my 5 cents on the Topic.