True agency in the isekai genre manifests either as the voluntary surrender of power or the involuntary accumulation of trauma. Comparing a YPS-5 physical powerhouse to a YPS-4 narrative anchor is an exercise in futility because their abilities operate on orthogonal axes. Diablo alters the physical landscape through raw destructive output, while Subaru alters the causal timeline through repeated death. The divergence is clearest in their DNA profiles. Diablo possesses high destructive capacity but negligible Growth and Ego; he is a static force of nature who finds fulfillment in becoming an extension of Rimuru's will. His power is a tool for curation. Conversely, Subaru's Growth and Bonds scores are maxed out because his influence is earned through the Darkness of psychological collapse. While Diablo acts as a shield that prevents conflict, Subaru acts as the catalyst that navigates it. One represents the fantasy of absolute competence serving a worthy master, while the other represents the reality of absolute vulnerability forging a leader. The gap is not in their YPS tier, but in the cost of their utility. Diablo's service costs him nothing, whereas Subaru's strategic dominance costs him his sanity.