The clan faction hopping makes no sense.
For example:
In my game, playing for the Aserai, I noticed Mesui (Khergit) was now a vassal of the southern empire. For ****s and giggles I convinced her to join the Aserai, despite having -100 relation and us never having met before. She agreed, joined the Aserai, and then 4 weeks later rejoined the southern empire.
Wat?