According to the common knowledge learned in class, the recognition of an Immortal Artifact usually involves several conditions: Luck, realm, bloodline fetters, causality, and compatibility with the cultivation techniques. Wei Yuan knew that besides Luck, he probably did not meet any of the criteria, and furthermore, he was far from meeting them. Given the Qingming Position, it's likely that even a Master Dharma Image would not be able to control it; only a True Monarch might attempt it. To be safe, it had to be an Immortal Monarch.
After activating Qingming, Wei Yuan realized the difficulty of its recognition, and he couldn't help but scorn Yun Xihe even more.
That guy must have been unaware of the recognition process, so he diligently served as a Physical Body God for over fifty years until his Primordial Spirit was dissolved by the Incense Fire Power.
