Horace Goodspeed is definately dead, yeah? Locke retrieves a map from his decaying corpse that indicates a clear location to Horace’s cabin.

Two thoughts. First the alledged ‘moving’ of the cabin. What if the original cabin itself never moved but a doppelganger image of the cabin moves. In this way Locke, Ben and Hurley meet up with the doppelganger, but only when he follows Horace’s map does John enter the real cabin. Or better yet, once the cabin is free’d from Ben’s influence (the ash?) Horace appears in Locke’s dream to give him a location where they can meet.

Secondly: We have seen two kinds of people in the cabin. Dead people (Christian) whose body may or may not be re-animated, and living people (supposing Claire is still alive) . The third definite aparition is the figure sitting in the chair wearing archaic clothing.

The odd thing about Christian is that he appears not only in the cabin but elsewhere on and around the island. He sometimes touches people (baby Aaron) and sometimes refuses to touch them Locke.

Horace does neither. He has only appeared in a dream.

I have no conclusion to this or deep theories. Just trying to put pieces together.

I think you are onto something with the cabin. I am still of the belief Jacob is, if not being held captive there, caught in time and space somewhere.

I couldn’t even make a guess as to why he’s being held prisoner, or by whom. Nor, for what reason.

I think ‘The Black Rock’ holds the key to much of the mystery surrounding Jacob. I also noted when Ben (as a young boy) first meets Alpert, Alpert is wearing a ‘period’ vest, similar to the period of ‘The Black Rock’.