0°Mandalore°0
Mandalorian Pride
I agree. The real threat here would be Nihilus. I think Revan would be able to destroy Sion easily enough, but Revan would also eventually be victorious against Nihilus I say, because besides that he would most probably recognize Nihilus as a threat very soon, Nihilus was actually careless in many ways, he was overconfident. In Kotor 2, when the Exile boards the Ravager, he doesn't even try to stop her, if he had really cared he would've come to her personally and kill her himslef.
Plus, Revan is smarter and has a far greater ability as a tactician, which would indeed be useful.