Apocalypse was a means for lesser beings to grow stronger, but at the same time, it was the very thing that would lead to the extinction of the lesser world as well as its residents.
While some beings embraced the strength they gained from Apocalypse, believing they would survive the survival-of-the-fittest rule and preferred to retain their sovereignty in their world, others, fearing their doom and extinction in the coming events, decided to pledge allegiance to higher beings and worlds, falling under their control. That was where the Administrators came into play.
The Administrators were representatives of the entire beings of the world they resided in, chosen by the will of their world. It was the Administrators who decided whether to submit to higher beings or remain independent, holding the key to the rifts that could allow the invasion of other beings.