So obviously we've seen so many of all the characters overlapping in flashbacks before. So I guess this is so that they'll be maybe be able to have a constant if this affects them.
Is this what Jack's problem was in the flash-forward in the S3 finale? Kate maybe using Jack as her constant, thus preventing him from 'going back'. Maybe Jack wants to anchor himself back somewhere else...the Island?...but Kate has found her anchor in the future, perhaps with Aaron.
I'm fascinated by all this but still struggling to get to grips with so much of it. Why does it come so easy to Roco and JB...
