About Adam and Eve, I believe someone previously mentioned it could be Rose and Bernard. For all we know, they are still alive and well, somewhere/sometime on the island. So, it could be them.
But, with the white and black stone, it would be more fitting if it was someone "good" and someone "evil".
Now, I'm trying to gather thoughts about the AR:
- John's life was different in the AR. His accident was different, his relationship with his father is different, and Helen is still with him.
- Jack's life is slightly different. I don't recall him having a kid in the original timeline.
- Ben's life is obviously different (as well as Alex)
- Sayid's life was different, as Nadia was alive in the AR
- Sawyer and Miles are cops!
- Hurley is now lucky instead of unlucky
However, as far I recall from the episodes this season:
- Kate's story up until flight 815 is the same.
- Claire seems to have lead the same life
- Charlie is the same as ever
- Jin and Sun seemed the same
Did I get something wrong? I'm thinking this idea is central to how the timelines will converge/ did diverge.