The only character I want revived is Heine. Of course I like Auel, Shani and the rest of the dead people but Heine is the only one who I felt "goddamnit that was SO unnecessary because he could have improved the series by enormous amounts by staying alive!!!!"
About Rey's next move: Something that would absolutely rule so much that it's inconceivable is if Rey would kill Talia for doubting Gil and then assume command of the Minerva. God, I can just see that in front of me, Rey likes shoots her down in cold blood and says something like "Gil's orders are absolute, you are all my bitches and I am his!".