New Brevoort Formspring

The Molecule Man is the means by which the Beyonders intend to destroy the multiverse. And if any universe dies early, it causes a chain reaction that (if I'm understanding correctly) takes out the rest of the multiverse. So it seems like one Molecule Man will do the job; why does he need to be in every universe, and what's the point of killing any more of him once the first explosion's already gone off?