It seems to me that you’re trying to invent a theory of kin selection between agents in possible worlds. Biology has a rich theory for how agents which resemble each other behave towards each other—kin selection. Biology too has to deal with other ways that agents can come to resemble each other—e.g. mimicry, convergent evolution and chance. However, in terms of producing cooperative behaviour, relatedness is the big one.
It seems to me that you’re trying to invent a theory of kin selection between agents in possible worlds. Biology has a rich theory for how agents which resemble each other behave towards each other—kin selection. Biology too has to deal with other ways that agents can come to resemble each other—e.g. mimicry, convergent evolution and chance. However, in terms of producing cooperative behaviour, relatedness is the big one.