One point is very important.
The Will of the Wizard World never refuses the emergence of new Saints.
Since that epic war between wizard civilization and the gods, no new Saints have appeared, for a variety of reasons.
Among them, two points are extremely important:
First, wizard civilization was severely damaged and needed time to recover, unable to produce too many top-tier resources for high-level wizards to use at will;
Second, the Will of the Wizard Civilization welcomes the emergence of new Saints who start a new sect and reach the pinnacle, not those who "usurp" or "snatch" the positions of the four fallen Saints.
Lotson said Mitchell was too hasty; he made mistakes due to these two reasons.