So wait.....still trying to absorb everything...... 1) If Locke never really came back to life, then that means that Christian presumably never came back to life either. "Christian" was presumably either Jacob or Jacob's rival all along. Probably Jacob's rival. Ilana says that Jacob's cabin has been "used by someone else". That was probably Jacob's rival taking the form of Christian, who used it when he talked to Locke last season. Jacob's rival (as Christian) tells Locke to move the Island. Jacob's rival (as Locke) tells Richard to mend Locke's leg, give him the compass, and tell him that he has to leave the Island and die. Jacob's rival (as Christian) helps Locke when he's down by the donkey wheel, encouraging him to turn it so that he can leave the Island and (eventually) die. 2) Richard had said of the 815ers trapped in 1977 "I watched them die". This presumably means that they were presumed killed in the Incident. He thought they died in the Incident, but, in all likelihood, they just ended up flashing back to 2007 or something, as I don't think they'd kill off half the cast. The fact that Richard remembers them on the Island and remembers them "dying" (as well as the fact that there's a picture of them) proves that Juliet setting off the bomb doesn't reset the timeline or anything. The Island that we see in 2007 has to have, as part of its past, the actions of the 815ers in 1977. 3) Jacob and his rival can't kill each other directly, because there are rules or something. Ben and Widmore also can't kill each other, as described in their confrontation last season.