Did anybody notice in the video that popped up after Locke beat the chess game, there was a bookshelf of manuals behind him? Then when Sayid goes into the secret chamber where klugh is, he finds a very similar looking bookshelf? I wonder if the place where klugh was hiding WAS the actual flame hatch, and the house on top was something built later. I remember Sayid looking at 2 of the manuals, one was protocol for a food drop and the other was a Dharma training manual, with all of this info I could see how the "hostiles" could easily take over this station/hatch and act like they were still Dharma.