That sounds reasonable, but I'm not sure whether there are countervailing factors when we're talking about lineages. When I say I'm not sure, I mean that I'm just not visualizing the logic clearly enough to have an opinion.

Also, if we're tracking male chromosomes to find out whether men have had children, do we lose track of their daughters?

How much does it matter in ordinary life that descendants presumably follow a power law distribution (lots at the top) rather than a bell curve?

How much of cuckoldry is break-even? That is, a man might be raising another man's child, but some other man might be raising his child.

Does people becoming less violent make a difference to the chances of male reproduction?

Onwards to hypothetical land: How much do men care about having descendants that they will never see? There are occasional scandals in which men who own sperm banks substitute their own sperm, which is interesting because no sex is involved. It also leads me to wonder whether male staff at sperm banks can be trusted.