That idea didn't come from Zelot or the devteam (or I don't know if they thought on that either), but Lotek (KNF leader) and me (KNF Co-Leader) talked about it, do you think that our characters based on samurai beliefs would betray their emperor? Not Sulu or Hiroito would do such a thing, even if the Emperor were not there to fight alongside with them. We decided to leave our characters there as [KNF] (You can call them Ronin even though it's not quite accurate as we follow our Master, the Emperor) and keep up the fight we have been fighting for so long now.
Even if Igiss wouldn't have posted this, our idea was to keep them in Leeds, and even more, we were going to fight against BAF still, but seems that is not going to be able anymore, not a big problem.
I don't know if it's a new NPC faction called Ronin, not that I care anyway (And I don't think it's a new NPC faction), as we were going to do it as KNF.