Nothing prevents them to mate again. Male octopuses are able to regenerate lost arms and the Hectocotylus easily. The best known species live fast and have short lives in any case.
Great article, and indeed confusing questions. Wish we can learn more about octopuses, specially the social octopuses.
Also interesting were recent mdma experiments on octopuses.
All this points to orphaned octopus babies having an advantage over those with living parents,
which is easy enough to fathom. Without mom and dad around, the kids are left with more food and territory for themselves.
However I’m still confused. Wouldn’t a given gene be more likely to replicate itself residing
in an individual that reproduced multiple times in addition to being in half the octopus babies it helped produce?