The Red Cabal's counterattack was more sophisticated and difficult to deal with than the leaders of red humanity anticipated!
In the initial years of the Age of Dawn, it seemed that the ability for the native aliens to adapt to the new environment was worse than their enemies.
Humans had experienced multiple periods of rapid growth and explosive technological progression. They were accustomed to producing a lot of new technological innovations in a short amount of time. They also possessed a secret cultivation heritage that gave them a head start in leveraging the greater potential of exotic radiation.
This gave humans the conceit that time was on their side. As long as they managed to hold their defenses against the aliens long enough, they would be able to turn the tables one day.
That assumption came under serious question after Ves learned what happened to Bridgehead One.