You know what? This is evem more confusing than I thought it was, then. It it was not meant as an explanation, then we are still left with the huge unanswered question of immaculate conception. And you LIKED it? You are being sarcastic, right?
I was honestly hoping for some explanation there. Why woudl they kidnap her? Why keep her alive? Why on earth Anaking did not check up on her earlier, then? I hope you can see that this situation is like pasted by random scenario generator.
Yes, Dooku, was all that, but why on earth get rid of him so early in the film and introduce a lame character like Grievous, who also is expendable as hell.
Yes, yes, I know the official explanation to make place for someone younger and powerful, but again, this is just done for the sake of "coolness".
To intorduce and kill off your characers because you don't know what to do with them is the technique which is used by teenager schoolgirls for their love stories. I strongly recommend you read "Anne of Green Gables" the chapter where girls form "Writing club" and read description of their techniques. The story in ROTS bears strong resemblance to some of the ideas Diana Barry, Anne Shirley, Ruby Gillis and Jane Andrews come up with.