I have a question for discussion more than a theory on this. In Cabin Fever episode when Locke, Ben and Hurley visit Jacob's cabin... Christian tells Locke he has to "move" the island in order to save it. A few episodes later at end of season 4, Locke and Ben travel to the Orchid, Ben blows open the elevator shaft, goes down to the chamber, turns the FDW to move the island and is transported in space/time to the Tunisia exit.... Then in episode 5x05 when Locke falls into The Well during the time skips, we learn from Christian that Locke was supposed to turn the wheel the first time, not Ben:
CHRISTIAN: You came to see me in the cabin. You asked me how to save the island and I told you you had to move it. I said that *you* had to move it, John.
LOCKE: But Ben said he knew how to do it! He told me that I had to stay here and lead his people.
CHRISTIAN: Since when did listening to him get you anywhere worth a damn? The good news is that you’re here now. You ready to go?
In addition, before O6 rescue, Locke kept telling Jack, "You're not 'supposed' to leave". So, my question is: What was "supposed" to happen if Jack and O6 had not left, and Locke turned the FDW instead of Ben? Why was it so important that Locke be the one to turn the wheel? If it was so important that Locke turn the wheel, then why didn't Christian emphasize that to Locke back in the cabin to avoid any confusion? We must assume Locke would have been transported off the island as Ben was. But what would have been the purpose? Up to that point Locke was supposed to replace Ben as the new presumed leader of the Others. So why would they want him to be transported off the island? Also, at that time Locke had no information about what to do when he left. He would have just been stuck in the Tunisian desert with no clue what to do next. Just looking for some thoughts on this... ? ? ?