it never really stops being an intensely personal story about loss, grief, and identity. there's a bit of a breather at the point you noted before the game begins to explore Zidane's personal history and the lengths some went to in order to survive death and the end of their world that they themselves caused. Brahne's personal ambitions were stoked into the flames of war by those who profited from it - who are these merchants of death and why do they seek the annihilation of the entire nations? Zidane's eventual crisis of identity on learning the truth ties the whole story together, narratively and thematically.