I believe that the cabin was never jacobs, but instead was the MIB. I think the ash that surrounded the cabin was there to keep him in the circle. This is why Illana and her crew were upset that the ring was broken, they knew that he was out and messing things up. I also think that when they called frank a canidate it was for jacob to assume his identity like the MIB did as locke becuase they might of known that since the ring was broken jacob was going to die or at least the form he was in at the time.
Either this or it is jacobs cabin and although the show showed Illana and jacob meeting it was mis direction and she is really working for the MIB and thats why they burned the cabin down. Its possible that she started working with jacob but was later approached by the MIB, and the show has yet to show it though.
Either this or it is jacobs cabin and although the show showed Illana and jacob meeting it was mis direction and she is really working for the MIB and thats why they burned the cabin down. Its possible that she started working with jacob but was later approached by the MIB, and the show has yet to show it though.