Hmm...I believe KSE isn't capable of removing party members that have
to be with you on a certain planet (like Canderous on Onderon), or adding those that can't
be with you (for instance Atton on Dxun, Kreia on Korriban, and your whole party on Malachor). So maybe he doesn't show up so that you don't do something you're not supposed to. Although, I don't see how editing his skills/feats/whatever would mess with anything. So maybe I'm way off.