I see that both Jack and John have grown since the crash of 815. Both have had their steps backward, but now Stronger Ghost Locke and Man of Destiny Jack seem to trying to make far reaching things happen. I guess I am in the minority, because I think Jack is doing what should be attempted. Don't forget about all the people that died from the crash and after the crash.
I really think the real destiny is for Jack and Locke to work together. I see that as the end of the multi-angle relationship with Kate. Both Jack and Locke are only truly happy when they follow their destiny. The island wants Jack to do something.
Kate is well, Kate. She can't be happy in one place with one man. If she is really there to find Claire, she should be doing anything to get back to 2007. Going back to James isn't getting her closer to Claire.
And great thought about Sun becoming Michael... JIIIIIIIN! Where's my HUSBAND?
