So i've been thinking about this a while guys. In 5x12 Ben stated that the Island has done incredible things in healing people, however in his own words-
"Dead is dead, you don't get to come back from that"
Clearly John is far more important to the Island and its future then it seems. Now after the last episode (5x15) and Locke's shocking plan to kill Jacob, does that mean he intends to take his place to become the others true leader?