I really don't see why some people view the change from Anakin to Vader so frickin' literally! He didn't literally become a new person. The old Anakin didn't literally die. That'd be like me saying I became Jay. I died, but I became Jay, so it's all cool. Is it so hard to think metaphorically?! He's literally the same person. He's just a changed person who disassociated himself with they way he was previoiusly. It's just like when an adult male looks back on some of the crazy things he did as a teenager, and he goes, "Wow, that was really stupid." He's not that same crazy teen, but it's not like he's suddenly gotten a new body and soul.

Come on, metaphor. Some people really need to look into it, especially George. Except that I don't believe George changed the ghost to Hayden because he actually believed Anakin and Vader were two separate human beings. He just did it to create that forced continuity that some people just gobble up.