So last night was the LOST season finale. I was less than impressed -- some things REALLY didn't work for me. But...after reading posts on Backspace and Absolute Write about the episode (what, you think writer forums are all about the writing?), I've come up with a theory.
Avast, here be spoilers. Read no more if you're gonna get all upset with me for mentioning something you didn't know.
Here's my theory: It's all in Desmond's mind. The Island, the Others, the Losties...everything. Desmond is told by Brother Campbell that he has a higher calling outside of the abbey. And Desmond caused the plane crash of Oceanic Flight 815 when he almost didn't input the code on time in the hatch. It's Desmond who is recognized by Naomi when she first parachutes onto the Island. He's the central figure. Penny is searching for Desmond. Desmond was the one who had to punch in the damned code -- to save the world. Desmond was the one who had a boat on and off the Island.
It's all about Desmond.
What's more, Desmond is the Merlin of the group; he sees the future. We already know he saw Charlie's future. What's to stop him from doing so with the others? (Or the Others, for that matter?) Perhaps Jack's flashforward was truly Desmond? If that's the case, then it's easy to speculate that Desmond could see the past as well -- the past of all the characters.
Why is he such a central force? I'm saying it's because everything from the very first episode has been in his head.
None of this is real -- except for Desmond himself.
I'm guessing that the last episode will show Desmond in an asylum (probably Hurley and Libby's asylum), and this was all a figment of his imagination, a la St. Elsewhere. It would explain all the connections between the Losties, all the impossible coincidences that bind them all together. Maybe Jack is his doctor there, which is why Jack himself is such a pivotal character.
That's my theory.