You seem bent on bringing back so many of the older characters from the first and second games. I can see how many of the newer players would like to see the old ones. Were you speaking about adding them as NPCs? Cause if you were, then I can see having one or two of them show up. But with the pssoble exclusion of Carth, as admiral onasi (if Revan repented), none of these charatcers, other than if they were turned into jedi, would show up, and even then, the chances of meeting mira, and atton, may not be all that great.
you have to remember that the many actions taken in the game, such as killing the jedi masters, or staying on Trayus academy to use the dark side, affects every charatcer. Few charatcers get out of this the same either way. The handmaiden is one, and Carth Onasi was another, but as you see, the questions at the beginning of the second game influenced whether or not he would appear. Imagine if you had to answer who knows how many questions to get the charatcers right.
And the exile has the same problems as Revan. How did he turn out? If he walked the path of the light, did he fall? If he walked the path of darkness, did he repent? What did he, or she, which is also complicated, look like? Will they show a bunch of portraits at the beginning of the game, and ask(kind of like atton) which one was the exile? The exile, rmember, didnt wear a face mask. The game would be incredibly complex if you tried all the combinations. If admiral onasi comes back and talks about the female, exile, using the pronoun she instead of he and all, may make it even more different. Some male charatcermay be surprised to be beaten in the butt by some female charatcer and get chastised. the whle conversation may be different between many of the charatcers would be different, from if they were your friends or not, did you have enough influence with them, were you romantic with them, if they were still alive at the end of the game, what happened at the end of the game, being disgusted by past actions, each would affect every single one of the NPCs conversations with each other.
Provided there is a chance to vbring some back, as was demonstrated in the second game.
My conclusion isnt exactly what happened in the last game. You were asked to find Revan by his friends, they didnt even know if he was still alive. And as for the genration thing, its how the game works, a pattern I noticed. Most can only assume that they will incorporate it into future games and designs, plus there is logic about how that works, as was mentioned.