I saw Fight Club again recently and watching it I was reminded of my Vader/Anakin split personality idea.

If Obi-Wan had a prior failed student young Anakin could build him up in his mind to a shadowy persona that could manifest as a masked fugue personality after the trauma of losing his mother.

You could even trim much of the terrible romance from AOTC and ROTS and have Anakin not remember being Padme's husband until the walls between the personalities start to fall down and she reveals the pregnancy to him.