If after his death, the descendants who inherit the throne are still young, the following old ministers will certainly refuse to accept it. If the rebellion is bound to be a disaster, it is better to get rid of all these founding fathers before his death, so as to deter all ministers and pave the way for the new emperor.
The most interesting case at that time was the aquamarine case. Aquamarine is Chang Yuchun's brother-in-law, and his childhood dream was to be a general in battle. And aquamarine worked hard for this goal, and the people around him were famous generals at that time, so aquamarine followed them and soon became a general who could fight and spell, as good as Chang Yuchun.
Later, Chang Yuchun and Zhu Yuanzhang recommended aquamarine. Zhu Yuanzhang saw that aquamarine was young and promising, and valued him very much, so he tried his best to cultivate him into the confidant of Prince Zhu Biao. Because Zhu Yuanzhang understood that after the death of his older generation, the country must have a person who can take over the heavy responsibility and defend the country, and Aquamarine is just a good candidate.
But to Zhu Yuanzhang's surprise, Zhu Biao died young, and his successor, Zhu Yunwen, was still a child. Besides, Zhu Yunwen is moderate and not tough enough, so he can't stop a general like Aquamarine. Therefore, in order to clear the way for his grandson to succeed to the throne, Zhu Yuanzhang had doubts about aquamarine and supported it by himself.