When Prince Chu left Wu Hua Mountain, he arranged for some people to remain in Guihua Village. Among them were Prince Chu's own people, as well as people from the Crown Prince's faction. This was to make the Crown Prince and Duke Zhen believe that there was nothing unusual about Wu Hua Mountain and that he hadn't found the stolen bronze.
In addition to this matter, there was another aspect that gave confidence to the Crown Prince and Duke Zhen, which was the Western Garrison Army Camp. Should the emperor truly depose the Crown Prince, the Western Garrison would rebel. However, rebellion is a path taken only as a last resort.
Unless driven to a dead-end, neither Duke Zhen nor the Crown Prince would consider rebellion. Rebellion is not only a capital crime but also damages reputations. Even if they succeeded, they would still be labeled as traitors, carrying the stigma of treason for life.
