You know, I may be stating the obvious, but this time travel hooey really puts a wrinkle in the plot and I'm not sure that I welcome it. I mean, anything that we've seen can be theoretically reversed ......completely, like it never happened. Anyone who we thought was dead can come back. Entire issues that had been resolved could open themselves right back up again.
Who knows, but the finale of the show could wind up being us watching a plane full of people flying past the island, landing in the US and going about their lives like the whole thing never happened.