I am on the side of those that think the story is moving into the reason why all this is happening, a staff change so to speak on the island. It's rumored that Christian is the or next Jacob, Locke will take the reigns of Richard and he will have to find a leader much like what Richard's purpose is, and Locke will look to Jack to become that leader, the hints are there that Jack's views are changing when he mentioned that maybe the island wants Ben to die and it's correcting mistakes.
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