lol
LoL all this speculation is just Circular Reasoning....Listen iv thought about this...and i belive this is how it is...Ahem...
When Anakin Skywalker went to the Darkside HE DIED...i know its been said But he turned to evil and basically in the case of the Force he....DIED
When Anakin Redeemed himself and appreared as YOUNG ANAKIN SKYWALKER it was a symbol of him becomeing who he once was....hence him appearing as WHO HE ONCE WAS a Young Jedi Knight that fell in love and fell into darkness.
When you redeem you'reself you become who you once were and the scares of you're past are erased as it is with the force....other instances of this are..even tho they dident die....
Bastila - All her Sith Stuff was destroyed and taken away...
If you play KOTOR II and KOTOR I if you go to Darkside you get scar like traits on ur face when you return to the lightside it is reversed...
I know those arent good examples but...JUST THINK ABOUT IT