Thinking about how finding Lira San and living on Lira San are probably two vastly different things for Zeb.
Maybe that's why we're seeing him Doing New Republic Stuff in 9ABY, because actually returning to the progenitor homeworld of your people is probably a kind of cold comfort when those people are dead? (I mean, I have Additional Thoughts on what he might have going on, but.)
Because sure the lasat on Lira San are also his people, but we actually don't know how long ago Lasan and Lira San split or what the reasoning was or how different their cultures become over time. So, yeah, finding Lira San was great - but living there might be the freaking worst sometimes?
Like idk what if the written language is too different to read and they don't use Basic because they're so isolated why would they? Or Lasan had a royal family, but maybe that's because the royals were exiled from Lira San which is now under a vastly different kind of government and everyone thinks royalty is weird? What if the Boosahn Keeraw is considered an "outdated" warrior philosophy by Lira San standards and being there is an awful reminder of being the last of his kind in a different way?
Just 👀👀👀 MUCH TO CONSIDER!