It was because Minghe knew the current situation that he felt at ease having Musen keep the Kongtong Seal. Though Musen was no match for the Sages, his identity as the Ancestor of Martial Arts meant they couldn't snatch the seal from him. Further, few people beneath the Sages were capable of defeating him. Thus, the seal would always remain with him.
Having combined himself with the Way of Heaven, Hongjun naturally knew the seal was the Treasure of Humanity. When he saw that all the Sages understood this, he said, "If you want to establish the Human Sovereigns, you need the Treasure of Humanity. So you need to consult... Minghe about it."
Minghe's expression changed drastically when he heard his name. Hongjun actually dragged him into this. Though he was indeed scheming, the tribe would eventually be formidable. They would be the future ruler of Heaven and Earth. If they were to be powerful, so would the Way of Heaven.
