Candidates and prophecies *major Harry Potter spoilers*
I know not all of you have read all the Harry Potter books(or have been able to see all the Harry Potter movies as the last one hasn't been made), but if you are going to and don't want to be spoiled, don't read this thread.
We all keep discussing who the candidate to replace Jacob will be, as if he is chosen or picked out of a hat, but what if it doesn't work that way? Perhaps the candidate simply has to WANT to have the job. As we'd seen, Jack was the only one who wanted to stay on the island in order to keep MiB there. Everyone else just wanted to go home.
In 'The Order of the Pheonix', the fifth book in the Harry Potter series, Voldemort tries to trick Harry into getting his own prophecy to him. Of course nothing goes right for Voldemort.
Dumbledore later explains to Harry what the prophecy was and why Voldemort wanted it: it was a prophecy given by a prophet, and it regarded the birth of someone special(either Harry or Neville, Dumbledore believed) who would later defeat Voldemort. Apparently it gave details how such would be done, which was why Voldemort needed it.
Dumbledore goes on to explain that it didn't matter if the prophecy came true or not, because regardless, Harry would want to stop Voldemort anyway. It doesn't matter if Harry was hand picked to defeat Voldemort because he wanted to do so.
Could it be the same for Jack or any of the others and MiB? Does Jacob not choose who replaces him, because he does not intervene? He theoretically brought 360 candidates to the island; surely one of them has a chance of wanting to keep MiB from leaving.