User blog comment:DazzlingEmerald/Not Another One! Fanon Canon: Plot "Z" (Soul Society Civil War)/@comment-18812574-20150412044823/@comment-28861328-20150412055215

I believe Sei's words were to the effect of there might be some in Soul Society, the Human World, and Hueco Mundo that would follow after Raian. He's been in Soul Society long enough that he's bound to gain followers and many of my old stories have taken him all over the Human World and Hueco Mundo. He has allies everywhere. That might cause a split, or it could be a bunch of other like minded people flipping Soul Society the bird. If Soul Society really wants to fight over that, that'd be you guy's can of beans, but it isn't even on Raian's radar.

If anything, Soul Society would be the one going after him (due to that pesky problem they have with defectors): not the other way around. His primary fight is with the Quincy, but yes, if your Gotei 13 decides to get in the way of his goals, he's going to kill your lot too. I'd hardly call that a civil war, though. But it actually could serve as a reason that this civil war fever begins to catch in Soul Society. The loss of a former Captain and respected member of society due to perceived failures in Soul Society's operations is naturally going to rustle some jimmies.

Food for thought. Generally, though, when a misconception takes place, simply asking myself or Sei will clear up said misconception. I don't bite.