Because these three people did not participate in the conquest of the Kangxi Dynasty in the later years, not only did they not participate in it, but also did not join the camp, so in order to ensure the conciseness of the main plot, the roles of these three princes were not involved in the "Yongzheng Dynasty".
The Fifth Brother Yinqi was born to Yi Concubine Guo LuoLuo, so it is said that he and the Ninth Brother Yinyu were brothers, but he was different from Yin Yu in terms of political tendencies, Yin Yu fell to the Eight Ye Party, while Yin Qi was always far away from political struggles, with a broad and generous personality.

But in fact, Yin Qi has the ability to take the wife, because he has some advantages. First of all, he was very popular with Kangxi, and grew up with Empress Xiaozhuang, which gave him a certain emotional advantage; secondly, he was made the Prince of Heshuo Heng when he was first deposed, and was one of the first princes to be made a prince. Third, he had a broad and benevolent personality, which was Kangxi's preferred style of a prince.
The sixth brother Yinzuo was a brother of the Yongzheng Emperor, and both were born to The Princess Wuya. But Yin Zuo obviously couldn't participate in the conquest, because he died early and died at the age of six, so he didn't have a chance.
The Seven Brothers Yinyou were actually very fierce, and in the early years, when he accompanied Kangxi in his conquest of Gardan, he had meritorious service and was promoted to the title of Belle. In the forty-eighth year of the Kangxi Dynasty, the crown prince Yin Rong was deposed, and Yin You was given the title of Prince of Dora Chun Commandery. Later, Yin You was ordered to manage the affairs of the three banners of Manchuria, Mongolia and the Han Army under the Zhenglan Banner, and scrupulously fulfilled his duties. It can be said that whether in terms of ability or title, Yin You did not have the opportunity to take the concubine, but he never participated in the conquest.
The reason for this is that Yin Yu realized that he had two biggest disadvantages, so he gave up taking the concubine.
First, Yin You's origin is not good. His mother was Concubine Dai Jia, and Dai Jia was not from a good background, and his father was only a seven-pin treasurer. Not only was he born poorly, but Dai Jia's position was also slow to rise, and Kangxi was only crowned as a concubine in fifty-seven years, so Yin You did not have the blessing of his mother's family, and he was not a good candidate for the crown prince for Kangxi, who valued his birth.
Second, Yin You has a disability, although it is not clear what kind of disability he has, but it should be a physical disability, such as a cripple or the like. Considering the sacredness and majesty of the Son of Heaven, a very important criterion for the Qing Dynasty to choose an emperor is that he is dignified, physically sound, and like a disability, he certainly cannot be an emperor.
Therefore, Yin You knew that there was no chance to compete for the throne, so he gave up on his own, ran errands in a down-to-earth manner, and was unknown, so he was not affected during the Yongzheng period, and retained his princely title, and lived until yongzheng died in the eighth year.