1) Did/could Vader have known about the Emperor's Clones as described in Dark Empire?
2) How does that change Vader's actions at the end of RotJ if he knew that he was (most likely) only destroying a clone and not the evil that is the Emperor?
3) What if Vader was hanging out with the Emperor this whole time on the promise that one day he would be ready to force transfer himself to a healthy clone the way the Emperor had been doing?
I think that's it. Mostly #2, though.
Matt