True agency in isekai is inversely proportional to YPS tier. Comparing a YPS-2 physical combatant to a YPS-7 authority figure is a category error; the scale breaks down because one operates within the world's laws while the other rewrites them. The real tension lies in their contrasting definitions of growth. Satou's maximum growth score is a mechanical formality, a byproduct of a system that grants him absolute agency before the story even begins. He treats the world as a simulation, managing his orphanage in Labyrinth City as a logistical exercise in comfort. In contrast, Rem's growth is an agonizing psychological ascent. Her trajectory is not measured in levels, but in the slow dismantling of her inferiority complex regarding Ram. While Satou uses his authority to erase risk, Rem's narrative weight comes from the fact that she cannot erase her trauma or her vulnerabilities. Satou is a static entity masquerading as a traveler, whereas Rem is a dynamic soul fighting to exist independently of her sister's shadow. The data reveals that while a YPS-7 can rewrite physical laws, they often lose the ability to experience a meaningful character arc. Meaning is found in the gap between capability and desire, a space where Rem thrives and Satou merely observes.