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Originally posted by: Hardcore Legend
Luke doesn't do anything. He has to be about the worst Jedi ever (sans those three that get bitched in the Emperor's office). He does get Vader down though, so I give him credit for that. However, he is not the one that fullfill the prophecy, it is Anakin.
If you think about it, Luke didn't do much at all. He simply let himself get captured by the Emperor and looked out of the window while the Emperor laughed of him. Then, he was atacked by the Emperor, and THAT made Vader think twice about the whole thing and throw the Emperor down the vault. So, even if he was not much of a Jedi, he was the one who brought balace to the force and who defeated (even if unintentionally) the Sith Lord.