"Aya-san. There's one thing Takeshi is much too gleefully forgetting.

A full-out war gets way too many people in the crossfire. The human world would be devastated by something it could not quite comprehend. We've kept our presence hidden from humans at large for a reason - so they could go about their lives in peace.

Trying to extinguish all Hollows is pointless! As long as the cycle of reincarnation works the way it does, there will be Hollows forever! And the same applies to Shinigami! Worse, if we lose this all-out war, there will be nobody to prevent Hueco Mundo from doing as it pleases!

And that's not all! The fallout from our own confrontations would cause humans to awaken spiritual powers too - powers with which they could oppress the weaker of their kind! It may even be happening as we speak!

I won't let you go about this fool's errand, Aya-san! It's not worth it! Takeshi is not worth it!"