What's wrong with the chosen one prophecy? Well, I used the wrong terminology, I just realized. Immaculate conception has to do with the religious belief of being born sinless, not a person has no human father. Anyway, what's wrong with a miraculous birth for Vader? It just sounds very cool, and makes his character more, interesting. It sounds pretty cool. Vader being the chosen one is good, because, it is a darker, more evil, yet good in the end, version of a savior figure. Darth vader is a very scary figure, with that samurai helmet, deep voice, mechanical breathing, robotic suit, a bald, burned up scarred face underneath his helmet, and he was once a very normal looking guy with long brown hair, evil yellow eyes, and that dark mysterious look on Hayden Christensen's face. That character being the "chosen one" sounds very cool. I know chosen ones are very cliche, but if you do it with a good twist, such as the chosen one becoming evil and disfigured, then it becomes more original. It makes Return of the Jedi more of a fallen messiah turning back to the light side and bringing balance to the force. It makes Return of the Jedi, when Luke unmasks his bald pale father, and has a celebration on Endor, much more of a rich story, with the chosen one in it. But that's just my opinion. As for the miraclous birth thing, it just makes sense with the messiah archetype, and it makes Darth vader, anakin skywalker father of luke, much more interesting.