The time shift comment? I drew that from the fact that the flashback began with Desmond waking up looking confused, then acting as though "Wow, how'd I get back here?" Not to mention the time travel conversation he had with his physicist friend. Just saying that I think Desmond's abilities and the flashback could have more than one explanation besides just the EMP field itself.
Obviously, it looks set in stone that quite a few things on the island are preset but how much of it is really preset or maybe some force (the smoke, "the island" whatever) guiding things to its advantage?
Here's what I find interesting: the old lady keeps telling Desmond he is the one to man the station and enter the numbers, ranting about how he CAN'T marry Penny, because HE has to go to the island and enter the numbers. How so? Calvin Inman was entering the numbers for years and if Desmond hadn't come along, someone else would have washed ashore later to push it for him. As Inman himself said to Desmond (before he was killed) "I needed another sucker to save the world!"
So, whenever someone like the old lady or "Yemi" appears to folks such as Eko, Locke and Desmond, their speech is always so adamant that there is no choice, YOU are the one that has got to do this, ect. which makes me suspicious.
Anyways, with this episode it's interesting how much Desmond has changed in attitude since when he was introduced last season. I remember when he once said to Locke "Don't mistake fate for coincidence."
edit: Someone on lost-forum.com was theorizing that the old lady was smokey trying to get Desmond to carry out its orders and pointed out something interesting. She firmly told Desmond "Nothing can be changed." Yet, last week, Alex's boyfriend was being subjected to a brainwashing film which prominently flashed "EVERYTHING CHANGES." Interesting. Maybe a clue that two bigger viewpoints on the island are currently clashing with each other?
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