Jacob seems to make a lot of promises to the Losties that have since gone unfulfilled….or have they? Ok, so Richard has asked to live forever, and that seems to be going really well for him, doesn’t it?? But apart from that, we saw Sayid being told he could be reunited with the woman he loves. What if Jacob grants him this wish, but not on original timeline, only in ATL? A friend of mine has speculated that maybe it is not Nadia that Sayid is wishing for but Shannon, who is surely due to make an appearance soon? Could this appearance be in the shape of love with Sayid in the ATL?
Dogen also made a bargain with Jacob, and we see that he is with his son, who is alive and well, in the ATL. Perhaps Desmond has made a similar deal with Jacob and thus accepted his on-island fate now that he knows he can be happy with Penny in the ATL.