>>96488186
We have been over this.

Notice the pattern of the ultimate chosen of Chaos.
Be'lakor, betrayed the Chaos Gods.
Archaon, betrayed the Chaos Gods
Horus, betrayed the Chaos Gods.
Abaddon, betrays the Chaos Gods.

GW will never have simps be the ultimate champion of Chaos. Since forever, GW adores the trope of the champion of Chaos being in opposition to the gods he supposedly serves. It creates riches and more interesting narratives.