Not Him

"The Sixth Son is totally off track. He is a prince, but he keeps dealing with business people. He barely comes and greets me throughout the year, and he barely stays in the capital either. He is not a very calm-hearted person."

"…"

"The Eighth Son is also very spoiled, arrogant and impulsive. He is never in a reasonable mood. He chopped the arm of an officer's daughter off, just because he got irritated. It ruined the girl's whole life. Also, he was born by Jiang Shuang, so he is part of the Jiang Family."

"…"

"Lord Ling is definitely the most suitable one. He is smart, honest, and filial. He is gentle and a very suitable heir. He will be accepted by the ministers and civilians for sure."

The Empress Dowager made an analysis about the princes.

As for the other princes, they were either too young or had a mother with too low a class. So they were never mentioned when princes were spoken of.