Frankly, when only three different influences had been roped into August's plan to save Arulion, it didn't seem like the scale was that big.
However, that was only if one didn't understand the scale of those three influences.
Starting with the smallest of them, August's people from Bastille.
Essentially the entire sect followed him to the Heavenly World. All of the people he'd brought in from different parts of the world, all of the subsidiaries that followed them, and all of the brothers, sisters, and mentors August had spent his year with decided to see broader horizons under his command.
There were hundreds of thousands of them. Sure, not all of them were combat-ready, but that didn't matter. They were not assigned to a combat-centric task in the first place.
If even the smallest influence who wasn't going to engage in combat was made up of so many people, then what about those who were actually fighting on the frontlines?