Agency defines the actual impact of an isekai protagonist more than raw destructive capacity. While Shin Wolford operates at a YPS-4 level, his low Ego reveals him to be a functional asset of the existing social order. His combat feats, including the defeat of the devil, serve to stabilize the world and protect his Bonds, making him a weapon of the status quo. Cid Kagenou, despite a lower YPS-3 rating, wields far more systemic influence because his high Ego treats the world as a sandbox. The gap between these two is a conflict between a tool and an architect. Shin's growth is a linear ascent toward a predetermined peak of utility, whereas Cid's trajectory is a chaotic expansion of a personal fantasy. When Cid triggers an atomic detonation, it is not a strategic move to protect a nation, but a stylistic choice that accidentally establishes a geopolitical superpower in Shadow Garden. This comparison breaks down if one looks only at the YPS scale; Shin can destroy more, but Cid dictates the narrative. Shin is the ideal citizen of a magical society, while Cid is the accidental god of his own delusion. The tension lies in the fact that the character with less raw power possesses the only will that actually reshapes the map.