The arrival of the higher-ups 'diplomatic mission would indeed pose a threat to Tang Zhen.
After gaining control of the territory, they would definitely carry out a thorough investigation to figure out the situation in the territory.
However, if that was the case, the various things that the puppets had done would be completely exposed to the diplomatic mission's members.
When there was no Overlord, some things could be sneaked through, but once someone used the Overlord's authority, those things could not be hidden.
It had already happened, and it was too late to cover it up. It was only a matter of time before it was exposed.
Once the diplomatic corps detected that there was an external force infiltrating and sabotaging the place, they would definitely immediately launch an investigation.
Although Viscount dunchi had been captured, it did not mean that his Foundation was weak. He also had many puppet gods under him.