Why can Wei Zhi in The Journey to the West cut the king of many rivers?

In The Journey to the West, the Dragon King can cut many rivers because it is Cao. Wei Zhi's "Cao Man" status is not his position on earth, but his position in heaven. The so-called Cao Man is the messenger of heaven and earth. Wei Zhi is just an executioner. He doesn't want to do it, but he has to do it. On the other hand, Yuan Shoucheng asked King Jinghe to beg Li Shimin, and asked Li Shimin to control Wei Zhi and not to cut him down. In fact, this is a trap, because Li Shimin is as helpless as Wei Zhi.

The cause of death of Jinghe Dragon King

Yuan Shoucheng, a fortune teller, was in trouble with many rivers. As long as someone asks questions and has a carp in his hand, he will tell many rivers the specific location of this big fish. His high-profile behavior naturally attracted the continuous attention of Jinghe's founder, Jinghe Dragon King. The Dragon King was angry, but he was targeted, so he went to smash Yuan Shoucheng's place. As a result, the Dragon King not only lost the bet, but also lost his life. The reason is that he changed the jade emperor's will without authorization.