The late emperor had not managed to revoke the regent power of the virtuous empress dowager before he passed away.
Xiao Liulang guessed that the late emperor probably felt that since he had left an imperial edict for the virtuous empress dowager to be buried with him, whether he revoked her power or not did not matter anymore.
Unfortunately, it was one step too short, as the imperial edict was stolen by the serene imperial concubine.
The virtuous empress dowager was supported as regent by the late emperor, and her continued regency under the new emperor did not stir as much resentment from the late emperor's former officials.
But as soon as this imperial edict came out, the former officials of the late emperor would, like ravenous wolves, inevitably drag the Dowager Empress Zhuang to the imperial mausoleum.
So Gu Jiao was right; the imperial edict could not remain in the hands of the serene imperial concubine. They had to find a way to steal it back and destroy it.