My impression of the Council of Six... based on the drips and drabs we've had on it... is that it has about as much political clout as a flea. It's a glorified swap meet where those few Clanners who still pay more than lip service to their shared past can meet and trade bloodlines and technical specs.
I'm not so sure. As of the Dark Age, the Council has about as much relevance as ComStar.
Yes, the Council of Six went from authorizing Clan support for Stone and the Republic during the Jihad to being a ceremonial body represented by each Khan's designee during the Dark Ages.
What I was getting at is that the orbital bombardment of Clan capitals in Jellico's plotline isn't that far removed from Dehra Dun getting nuked by the Not-Named (or whoever pinned it on the Not-Named). I'd have to think that either the Horses or the Wolves (or both) would use that as pretext to call for a Trial of Absorption or Annihilation.
Maybe that would happen someplace other than the Council of Six in the late Dark Age timeframe. Maybe the Horses or Wolves would just declare the trial without the agreement of the other clans.
But it's hard to see how clan-on-clan WMD or orbital bombardment would not be met with absorption or annihilation (or at least the attempt), even if just for political gain, especially given the official history behind the Not-Named, the not-so-distant Jihad, and how the Spheroid Clans shut down contact with the Homeworlds Clans after the Wars of Reaving.
FWIW...