It wasn't just the Monster Sovereign who failed in their duties. The whole of Heaven Court had become a troupe of amateurs merely muddling through their roles, shirking responsibilities. They would procrastinate if they could, and if not possible, they would display a mere semblance of productivity.
If this was the state of Heaven Court, how could the Three realms remain in order?
Everyone was competing in incompetence, there was no denying that. However, the appearance of Jiang Chen had given the Emperor of Heaven a glimpse of hope for change. Therefore, he intended to entrust the power of the Great Emperor Gouchen to Jiang Chen, so he could rectify the decadent state of Gouchen's heavenly palace.
At the same time, it was also a test for Jiang Chen. The Emperor of Heaven wanted to evaluate Jiang Chen's competence and his capacity to rule the Human Race through this endeavor.