Bringing either Revan or Exile back is just plain stupid. What level of power are they? 20 freaking pluss levels. Hello, can we say GODHOOD here? Bioware left no room for a sequel in the first game and that is doubly true in Obsidian's game.
If the KotOR game were meant to be a trilogy they should have designed them so from the very beginning. THEY DID NOT. Tacking a sequel on a game that is designed to be closed and over with is like shoving a fist up the arse without lubricant.
In a proper trilogy there are two storylines, which are both fully developed. One is the over arching story that connects all three stories and the individual story line that has a solid conclusion to it at the end of each part, with the third part merging the over arching storyline with its own individual story. THAT IS HOW IT IS DONE.
Just to clue you in folks, that lack of an over arching story line is why the Cliffhanger in KotOR 2 FAILED while the one in EMpire Strikes Back didn't.