Also if you think about it, when Luke went after his father in ROTJ he became angry when Vader threatened to go after his sister, Skywalker became angry and beat down his father and was tempted by the dark side which he refused.
With Vader, Palpatine and all of the other jedi gone, there was one force user who had used elements of both sides of the force thus the balance. I think that Luke was actually the chosen was, and Vader was the Catalyst.
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My name is Ozymandias, King of Kings;
Look on my Works, ye Mighty, and despair!
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