[FOTS] Question on AI Behavior.
Recently, I did a campaign as Satsuma in FOTS, and I decided to put some spice on my first playthrough, after capturing hyuga, I'd flip shogunate, larp as the southern vanguard. (Which i couldn't do, somehow the shogunate AI locked in and I couldn't do that, the campaign ended anyway without me reaching realm divide because the last imperial holdout was gone.
Anyway the main thing of concern to me was: Why wasn't there any side switching? Overwhelmingly the only time a clan switched sides was to actually join the shogunate (in the case of the Tsu even if they did it too late), none of the major imperial clans like the Jozai, the Sendai, flipped Imperial.
However when I played as the Aizu, the exact opposite happened, everyone decided that the emperor was their new best friend, the Sendai, the Jozai, the Nagaoka, basically, I'm asking, was my satsuma campaign an isolated case of RNG working on my favor? Or is there just some AI magic behind the codes that hardcodes northern clans flip imperial if the player controls the Aizu Domain or the Sendai Domain.
Is this just a classic case of anti-player bias which I shouldn't think too deeply on?