The World Alliance has already formalized and prepared what they needed to do. Most of the kingdoms and races will send at least half of their best fighters in the front lines. This made it easier to give the number of people that will go into battle which Adrian needed. The number of people that signed up ballooned in just two hours as the raid will happen after two days.
Due to the threat of the Primordial Beasts of Sin, the Daemos had no choice but to use all hands-on deck. All of the Daemos scattered in the world had to be recalled back to Avalon but the observation for all parts of the world was still ongoing. They may have left their stations but the efforts for observing doubled which meant double work for the observers.