I think the Island is caught in a perptual time warp. The space/time continuum mentioned by the writers in the recent summary plays an important role. The Island is somewhere on the space/time continuum, but not necessarily in the space/time that we live in here and now.
There are flashbacks, which are really for the benefit of the audience to inform us about these characters and how they came to be on the plane.
The flash forward, or whatever it was, of Jack is not necessarily something that did happen or will happen. It may happen.
The bearded, drug addict Jack is desperate to get back to the Island, but he can't. It's like Shangri-La. It doesn't exist in our world. The Island exists in its own little bubble of time, out of sync with our world.
With the Island in a time warp, it's possible that Jack's father is still alive, that maybe Kate hadn't yet killed her father. It opens up limitless possibilities. Limitless "what ifs."
I bet the Island explodes at the end, disappears completely, so no one can ever go back, and the Roses and Rosseaus and Bens and Lockes of the Island will be devestated, or dead. I think that's what Ben and Locke are fighting for... to keep the Island as it is now, safe in its little time warp where no one can really get them.
OK, so how did all those people arrive on the island, come and go to and from the island, and how did the parachutist find the Island? Sort of blows my theory out of the water. But maybe not. Maybe, the Island is so magical, the electromagnetic force so special, that it seeks out certain people and allows them to see the Island.
Who the heck knows?
Reading is freedom.
The mind soars, no earthly cares,
no limitations.
A Maggers Haiku, 2005
Years ago my mother used to say to me... "In this world, Elwood, you can be oh so smart or oh so pleasant."
Well, for years I was smart.
I recommend pleasant.
You may quote me.
Elwood P. Dowd