The battle for the Divine Throne began during the time of the selection of the Third Sovereign. It is during the clash between the two potential candidate of Sovereign which is the battle between Katarina and Jean.
Raymond had reign for one hundred years at that time and he was ready to crowned a new Sovereign as the energy of the world was ripe for another strand of omnipotence.
The All Source is an unlimited power source.
But unlimited does not mean that it is always full. Unlimited energy producing artifact but even this artifact had a rate of which it produces his energy.
If one took all of it, then one would have to wait until the energy of the world returned back to the amount of energy needed to break through the Half Sovereign realm to the Sovereign realm
Each time a Sovereign is crowned, a great amount of energy is absorbed. And the process of replenishing back that energy that was absorbed roughly take one hundred years