True agency in isekai is inversely proportional to narrative power. Placing a YPS-5 primordial beside a YPS-4 reincarnator exposes a stark divide between being a tool of a system and being a participant in a life. Diablo functions as a static constant; his lack of growth and ego is a choice. He trades the burden of self-determination for the ecstasy of servitude, turning a continent-level threat into a glorified secretary. In contrast, Rudeus spends every waking moment fighting the gravity of his former self. While his YPS-4 status puts him a full tier below the destructive ceiling of a primordial, his DNA profile reveals a grueling climb in Growth and Bonds that Diablo ignores. The comparison breaks down when looking at combat, as a YPS-5 entity operates on a scale that renders personal struggle irrelevant, but it succeeds in highlighting the "power trap." For Diablo, total power is a means to achieve total submission. For Rudeus, his power is a fragile shield used to protect a domestic life he feels he does not deserve. One character is a primordial pretending to be a man to serve a master; the other is a broken man pretending to be a hero to save himself. This reveals that essential growth occurs not when a character ascends the YPS scale, but when they struggle within its limits.