During the episode "The Man Behind the Curtain" we briefly see a man in the chair, to me it looks alot like Locke. I think this is Jacob's nemesis in the form of Locke. The ash surrounding the cabin is probably the same ash that Bram uses to protect himself from the smoke monster, meaning that the monster cannot enter the cabin. This is why I think that in the end fake Locke will be imprisoned in the cabin and will be surrounded by the ash. I will soon be writing another page about who I think made the gap in the ash that we see in the season 5 finale, and also about the smoke monster...
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