Honestly all the father related plot twists would feel empty and meaningless…the trope has been used to death. Smith is a joke, and the “it was all a dream” twist would only cheapen the experience. The number thing feels pointless too…number 47 was chosen because it was an awesome number so trying to change it to 48 or 57 or whatever feels meaningless…even the so called “real” 47 is just another clone so it hardly matters whether they try to say that 47 was some other number. The child discovery also feels empty…it was never hinted at that 47 was in a relationship with anyone before so trying to introduce some newborn out of nowhere hardly feels important. So all of those feel kind of empty. Diana being in love with 47 seems absurd though…not sure this is that kind of story…but I would be ok with 47 getting a happily ever after story if iOi felt inclined to go that way.