Having recently watched ROTJ (the collaborative edit, well done overall guys!, not everything was to my taste, but it was pretty dang good, nonetheless), there's a bit of talk from Vader, Emperor, and Luke about destiny.

I assume this is where George was trying to go with the whole prophecy thing, but it never came into play where we see Anakin's issue with the prophecy...

It would be nice to see Anakin struggle with himself being something more, or having some destiny that he doesn't want to accept, but is forced to for some reason or another... Comes to accept his fate in a dark way, which explains why he is the way he is in ROTJ.