I like the Vader is Luke's father twist better, but the other is interesting.
Gaffer Tape said:
...Anakin was under the impression that Obi-Wan was banging his wife...
I don't even remember that. They should have played that up more- Ben should have been deeply in love with Amidala, then rejected when Amidala chose Anakin over him.
Not that that would have made those movies NOT crap, but it couldn't have made them any worse.