Now, that IF Rinoa = Utimecia, but if not?

And if they kill Rinoa now, she has to pass her sorcerer power to other girl. Then that other girl will be the next Ultimecia. And if they kill that other girl as well, the power will move to other girl then other girl then other girl and in conclusion, they have to kill all the girls in their world.

Problem is, can the power goes to a man?