I think that's going to be the underlying theme or answer to this whole show.
Alternate realities would explain why all of them knew each other in some manor.
They were all destined to join at some point in their lives. But it took the million choices and decisions in millions of alternate universes before they all lined up perfectly.
I'm intrigued as to what will happen in this new alternate universe. Will they eventually all get back to the island signifying that you can't fight fate?
But what is fate? Jacob makes a point over and over that we're all of free will.
But at the same time, people are slaves to their personalities. They'll eventually make the same choices over and over again, which in turn might be mistaken as fate.

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