It's worth noting that both Dementia Pugilistica and CTE seem to take a decade or longer to appear in affected individuals, which means it is unlikely that they

It's worth noting that both Dementia Pugilistica and CTE seem to take a decade or longer to appear in affected individuals, which means it is unlikely that they would have a significant impact on an individual's ability to reproduce (especially if winning a fist fight led to immediate opportunities to mate).