I'm not going to say I've been tuning out Bozja's story so much as doing it so slowly I forgot that "HATRED IS WOT DRIVES ME" was the leader of Bozja imperial occuptation
anyway Gabranth's Thing was he was going to create a "new nation" from Dalmasca/Bozja using Imperial resources, and when the Empire went into disarray it gave him and his legion the opportunity to go rogue
The IVth is united under a mantra of creating a utopia of equality (highly doubtful it would even be that) but many of its members believe in Gabranth and his vision
as to how a hyur could become legatus it's not entirely clear outside from the fact that Solus seemed to like him, and may have manually placed him there
this is why Misija betrays her country, because she suffered under Bozja's very strict caste system and the IVth Legion reached a hand out to her, even though they didn't do it out of the goodness of their own hearts, they still offered her a better life than her fellow Bozjans did
the playerbase asks yoshi-p for one more thing and its the thing he won't give us. Less robes on magesby now they've actually also lowered their bar to "can we have something that isn't white"white or black/grey