True agency in an isekai hierarchy is inversely proportional to raw destructive output. This comparison reveals a stark irony: the entity capable of erasing continents is more psychologically tethered than the man trained to be a disposable weapon. While the YPS-5 scale places Diablo in a tier of strategic deterrence, his Ego score of 15 exposes a total surrender of will to Rimuru Tempest. He transforms apocalyptic power into bureaucratic efficiency, choosing the role of a butler not as a disguise, but as his primary identity. His stability comes from this absolute submission. Conversely, Lugh operates at a YPS-3 level, where combat remains a matter of tactical precision rather than planetary reshaping. Yet, Lugh possesses a Growth score of 100, reflecting a conscious effort to manufacture a soul and escape the identity of a tool. Where Diablo finds liberation in servitude, Lugh views his role as an assassin as a professional constraint to be optimized and eventually transcended. The gap between them is not merely a matter of mana output, but a fundamental disagreement on the value of the self. Diablo is a primordial force that has opted into a leash; Lugh is a human instrument attempting to break his. This disconnect renders a direct power comparison meaningless. The real tension lies in the fact that the character with the lower destructive ceiling is the only one actually fighting for his own autonomy.