Could Christian Shephard REALLY be on the island?

Taking into account what we have learned in "lighthouse" I think that Christian has really been apearing to people on the island. Claire mentions both her father and her "friend" as two diffrent people. So i assume that either she doesnt suspect MIB to be her father or he flat out told her "that guy really was your father". or possibly i could be completley wrong on this issue. And btw dead Jacob is freaking me out.

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