LOST - season 6

[Panda Khan]

Spoiler:

My take on Christian's appearance is that it was MIB the whole time. When Locke meets Christian at the wheel, he convinces him that he must die, that wheel was later explained to be built by MIB. This was MIB plan. He couldn't kill him on the Island because of Jacob's protection, however he could kill him indirectly off the island by Ben, who thought he was doing right by bringing Locke and the Oceanic Six back. I think he wanted Locke dead because taking the form of a dead candidate of Jacob's is the loophole that he needed to kill him.
MIB not being able to leave the Island would be contradicted however by Christian's appearance to Jack in LA...which personally I feel was a hallucination, much like Michael's hallucination of seeing Libby at the hospital out of guilt.
Another contradiction of not being able to leave the Island is Christian's appearance to Michael on the freighter right before the bomb explodes. I thought about that appearance but it makes sense to me that this appearance was MIB because he was waiting for the chopper carrying the Oceanic 6 to refuel and leave the boat before he let the bomb explode. With the Oceanic 6 dead, Locke would have never left the Island and MIB would not have his vessel to kill Jacob.
Christian also lead Claire off into the jungle which she confirmed this season was the same thing as Flocke. His appearance is also seen at the cabin along with what appears to be Locke's eye.
Another contradiction I thought about was Ilana mentioning that the Locke form of MIB wasn't able to take the appearance of anyone else now that he was in Locke's body. This however isn't true because after John's corpse is brought back, MIB takes the form of Alexis in the temple wall, and also Christian at the barracks to Sun and Frank. Unless Ilana meant that once Jacob is dead, MIB is stuck in Locke form.