Why did MIB want to kill all the Candidates at the same time?

≈why did the MIB go through such a complicated task to try and kill all the candidates? for instance why didn't he just kill them like he killed jacob, using someone else to kill them! Why couldn't he have simply ordered the others to shoot them off one by one? Also, why did the MIB rescue jack as well? Remember when Widmore's people started firing mortar bombs at the MIB and the others, why did the MIB run to the rescue of Jack, he should have just left Jack to die and get blown into pieces, and that's one candidate out of the way, so why save him? It just seems he chose the most difficult and complicated way to kill the candidates, when there were much easier simpler ways to get the job done.

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