I think dave's whole deal with moms can pretty easily be spun into a reading about wanting to be a mom, especially taking into account his entry item (both through seppucrow incubating the egg and retroactively with trans terminology about eggs) and his struggle with and rejection of the masculine role beta dirk pushed him into. I even think this ties deeply into his falling out with dirk in the epilogues, as the last real conversation we get between him and dirk is the rooftop conversation where he and dirk talk about their respective bros and how dave's bro was basically the exact kind of person dirk fears he is deep down and dirk never knew his bro but he and others liked to think he was the exact super cool stoic masculine irony man that beta dirk tried to raise dave to be which he hated.