Well, Im going by the
Official story here: Revan is male and choses the light side ALL the way. The lightside choice for the Uthar and that twielek sith is that you kill them both (Ya, really lightside eh? kill em all!). So Uthar is Dead. Remember Malaks apprentice? He looks kinda like sion. Hell, Jolee looks kinda like Sion exept hes black (no offence
). BTW the Official story isnt like a releaded document, its waht the developers said happened in Canon, and what they will base the story on. In the canons you always choose light.