I think when the Jedi said "The Prophecy speaks of the one who will bring balance to The Force" they were indeed reading into it wrong. It wasn't just about destroying The Sith. The Chosen One had to destroy The Jedi too. To bring forth a new Order and approach to The Force. A "grey" approach.
I think Anakin was the first grey Jedi, sent by The Force to bring about the new Order. He fulfilled part of his mission as Vader in destroying the oppressive nature of both the Jedi and the Sith. Now as Rey, The Chosen One can fulfill the resolution The Whills wrote about.
(^that's the first page of the TFA novelization)
Yes and it may end up being both Rey AND Kylo fighting the FO in the end. I do think he will redeem himself or possibly even bring her back from the brink of the dark.
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