True sovereignty in isekai is less about the YPS-4 destructive ceiling and more about the direction of the protagonist's emotional flow. Comparing authority-type power to physical-type power renders the YPS-4 designation a superficial metric; Ainz commands through the systemic weight of Nazarick’s hierarchy, while Naofumi survives through the material optimization of his shield. The divergence lies in their DNA Growth and Ego. Naofumi represents a total recalibration of the self, moving from a zero-ego survivalist to a reluctant patriarch whose bonds with Raphtalia and Filo are hard-won assets. Ainz experiences a decay of self. His growth is a performative descent into the role of the Overlord, where his bonds with the NPCs are not relationships but obligations of a corporate manager. While Naofumi builds a community from the wreckage of betrayal, Ainz maintains a facade to avoid the terror of being seen as a fraud. One transforms trauma into a shield for others; the other hides humanity behind a mask of skeletal omnipotence.