Think about this:

But for the sword, they’d all be dead.

Otachi would’ve destroyed Gipsy Danger, then returned for the still helpless Striker Eureka. They would’ve had to nuke Hong Kong to stop her.

Hours later, three kaiju emerge from the Breach, including the biggest one ever (capable of surviving a really huge nuclear blast), and there are now no Jaegers between us and them.

The fate of the world, but for the sword.

And now think about this:

Mako is the daughter of a swordmaker.