The main issue was that Zhao Gongming needed only a few auxiliary materials to refine a postnatal Ultimate Treasure.

There was no need to hold onto the sixth Kirin Scion Wang Tianpeng's half-finished postnatal Ultimate Treasure.

Moreover, the power of a half-finished postnatal Ultimate Treasure was not even as great as a Supreme Quality innate Divine Treasure.

To refine that postnatal Ultimate Treasure into a true postnatal Ultimate Treasure, a Chaos Stone was required.