I am almost finished with season 4 in my rewatch and I have noticed sooo much more than I did the first time around. Something that confuses me is when Desmond starts mind jumping on the freighter. What I gathered from this is that his consciousness got stuck in the past when he was in the army, and then jumped to the future where he does not recognize anything. That is why he told Penny he'd call her in 8 years. I think this was a big clue to season 6. That was the first time we had seen anything happen from the past to the future. All the other time or mind traveling episodes goes from the future to the past. This theory is only compatible with the people on the island.
Ok. So. The losties are in 1977 trying to stop the crash in the first place by stopping the Swan from ever being built, right? Well, I think when Juliette smashes Jughead, the sky turns purple for a few minutes just like it did when Desmond turned the failsafe key. Then, the purple fades and everyone is standing around the exploded Swan site and they are all ok. Even Juliette.
Except they are not really ok. This is similar to one of my other theories, but different, also. What might happen is the people that were in close proximity to the bomb start mind traveling...into the future. Like Desmond did. Since it is 1977, the purge is still in the future, and that is one of the places they go.
In the middle of the purge, they are being gassed, and all of a sudden their consciousness skips back to the past. They all appear dead, and their bodies are thrown into the pit, but they come back and climb out of the pit and hide until they mind travel again.
Each of them are mind traveling to different points in their lives. What the audience sees is them living in 1977 (possibly being held captive by Dharma and a trial,)and all the while having flashes to different parts of the future, some we have seen, some we have not.
So, they are living their present consciousness still in Dharma (but are blacking out frequently due to mind skips)and skipping to different points in the future.
This just came to me as I was writing: The skips into the future start at the point furthest into the future and go backwards in time. So, we'll see them in 77, then they will flash far into the future. Then they'll flash back to 77, then go to the future, but this one is before the first future we saw and will explain unexplained things that happened in the first flash to the future. So the purge scene that I mentioned will be one of the last future scenes.
So the present consciousness of the losties and the flashes to the future will eventually get closer and closer together and eventually meet (probably right before the crash of 815.)
This is all speculation and I really have no evidence to back it up, but it was fun thinking about.
I also have some things to say about WHH vs. ALT.
Why can't they go hand in hand? If you have WHH, one timeline that cannot be changed, why can't there be places where there are more than one way to get to certain points on the one timeline?
Kind of like:
--------E->-----E->--------E->------------
The dotted line is the timeline, the E is three separate ways to go, then they all merge back together with the > and continue on to the same result. That would mean that limited freewill exists (that's an oxymoron.)
Also, another idea is that why can't WHH be what what has happened? Desmond doesn't hit the button, the plane crashes, they meet the others, they go back in time and become Dharma, they blow up the bomb, season 6. As we are seeing it IS WHH. That would mean that the present is all that really matters because it is what is happening. It doesn't mean that it always happened, it means that it is happening right now.
So, the first 1977 incident happened without the losties, then the purge in 1992, then Desmond comes, then the plane crashes, then they meet the others, then they go back in time to 1977, then they blow up the bomb. It's only one timeline and only the present matters. Sorry if this is hard to understand. It's hard to explain.
Also, I think the smoke monster IS the island. The producers said the island is it's own entity, and Locke said he looked into the eye of the island. I think the monster is the island.
Anyway, those are my thoughts. Lemme know what you think...