This is his last comment on the changing of time theroy:
Uh Oh!
It certainly looks as if things *have* changed. From the moment Sun and Faraday walk past the rusted lamps on the rundown Dharma dock to minute they arrive at the overly ramshackle barracks... something's way, way off. This isn't the way the Others left the barracks not-so-long ago, and it's definitely not the result of a few short years of neglect. Big trees grow way too close to the buildings, and everything looks extremely beat up. As Christian takes them inside the recruitment center, we see printed signs hanging at odd angles and the dust-covered photographs and recruitment materials used by the Dharma Initiative. We saw this place 10 minutes ago in 1977, and now we see it 30 years later... only it can't look this way because after the purge we know the Others lived here for a good decade or more. And when they did live here they kept **** neat and tidy - they kept the bushes groomed, the grass watered, and Ethan was pretty handy with a hammer and nails. It's not possible that the Others would live here without de-Dharmatizing the barracks, especially considering It would get a little creepy living somewhere surrounded by photos of people you mass murdered with poison gas. So what does it all mean?
It means of course, that something's changed. Someone has changed something in the past to create the timeline Sun and Frank are now seeing. This jives well with the original transmission still coming from the radio tower, and on a more extensive level it explains the subtle changes in scenery, decor, and circumstance that we've seen throughout the whole show. Faraday's theory appears to be wrong: things can be changed. The bigger question is this: were they changed for the better?
Was the purge avoided? If so, what happened to Dharma? What happened to the Others? Is the whole island dead? Is the whole world dead? Was the war Widmore predicted already waged? If so, did the right side win? And if something really terrible did come to pass, how can Sun, Frank, Ben and Locke fix it? Or is it up to the 815 crew to make those changes from their position in the past? BIG questions.