Optimization is a trap that masquerades as agency. A direct YPS comparison fails here because it pits a YPS-1 authority-type against a YPS-3 physical-type; measuring Shiro's analytical ceiling against Tanya's city-level explosions is a category error. The real intersection lies in their shared zero Ego score. Both characters operate as biological calculators, stripping away personal desire to solve for the most efficient outcome. Shiro does not play to win for her own sake but to maintain the equilibrium of her bond with Sora. Tanya does not seek glory; she seeks a safe rear-line posting, yet her efficiency in the 203rd Battalion only accelerates her ascent into the meat grinder of the Empire's war. Shiro's intellect is a tool for survival within the rules of Disboard, while Tanya's rationality is a weapon used to fight a god who hates her. The difference lies in their Bonds. Shiro's narrow focus on one person provides a fragile stability, whereas Tanya's professional bonds are mere assets in a corporate military structure. Both reveal that in isekai, high-rationality characters are the ones with the least control over their own destinies. They do not drive the plot; they simply optimize their response to it.