I've done something among the lines in my Kabal's fluff, they follow the Archon because he held together a dying kabal and gave it new life, they aren't 100% loyal, but since the kabal is all about grow through show of power and followers rather than a lucky death. They kind of look down at back stabbing, since anyone can do it, to actually get people on your side and then confront him you gain some power.
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"Hear our call children of the void, listen to the screams of your brothers and sisters, see the raining ash from your home. Do you have what it takes to stand back up, or will you fall like so many before you."
- Zorev Norterus, Archon of the Immortal Eclipse
Kabal of the Immortal Eclipse | Coven of the Shadow Flesh | Cult of the Black Rage