What Does it Take to Become Jacob?

How does a candidate become Jacob? He had supernatural powers, didn't age, could make others immortal, could bring people to the island, et cetera, et cetera.

We also have candidates to replace him -- ordinary people with no special "powers". But how does the chosen candidate get Jacob's abilities? Is it simply being the last candidate on the island? Alive? Does it come with time? What do you guys think?

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