I say none of them.
1. Revan. If Revan is LS, then he/she will oppose the True Sith, and if he/she is DS, then they won't want to share power
2. Exile. Again, no. Most likely becoming Revan's sidekick (if Revan still lives) so see above
3. Bastila. No. She either learnt her lesson and went back to the LS, or is Revan's companion and follows his/her lead
4. Canderous. Nope. Remember, Revan sent Canderous back to re-form the Mandalorians in order to have an army with which to fight the True Sith
Dark Lord of the Purists
Inter Arma Enim Silent Leges