Even if there were not many Chaos Divine Treasures, "He" could not let them go, it would be a waste not to take it anyway.
After the Chaos Divine Treasures in the Ultimate Void Battleground were completely taken away, Zhou Zhou could ask Zhou Fight to investigate the source of the Chaos Divine Treasures in the Crimson Great Cosmos.
If "He" could figure out the source of the Chaos Divine Treasure in the Crimson Great Cosmos and grasp the method to obtain it steadily.
Even though "He" had lost the source of the Chaos Divine Treasure, the Ultimate Void Battleground, "He" would still have a new source of the Chaos Divine Treasure.
Moreover, the Chaos Divine Treasures produced from this source might be even more than the ones produced in the Ultimate Void Battleground.
Second:
It's about the Ultimate Void Crystal.
If the Supreme Will defeated the Void Emperor, the Void Emperor would definitely escape with "His" Ultimate Void Race.