Exactly, he might had been lucky and survive some plague, or killed every body else in a small group that was lucky to survive a plague. Or he simply might hav

Exactly, he might had been lucky and survive some plague, or killed every body else in a small group that was lucky to survive a plague. Or he simply might have had a large harem and so a his descendance was more numerous that other people and thus more likely to survive a subsequent struggle or plague. It's also possible that this event was repeated often enough and all that our statistical methods of DNA matching can see is a single father, but it could perhaps have been a whole dynasty and/or brothers sharing mating privileges.