There were many concubines who had the same thoughts as Concubine Zhao. If the prince only started learning about intercourse at 16 years old, wouldn't he have to be 16 or 17 years old to take a secondary consort?
But at this age, the prince should already be marrying his main consort.
Other than the Empress, all the concubines in the harem came from modest families. Their family backgrounds were not compatible with the prince's. Even if they were the biological mother of the prince, they would not let their son marry their niece as the main consort. Therefore, they could only place their hopes on the position of the secondary consort.
A secondary consort who would give birth to the eldest son.
Because of the abolition of the vassal system previously, the concubines in the harem already disliked King Rong's family. When they heard King Rong's estate was also responsible for this change, it only intensified their frustration.