It stands to reason that such Cao Cao doesn't want to leave any hidden dangers. However, one person is an exception-Cao Cao saw that he was ambitious before he died, and specially told Xelloss to pay attention to this person, but he did not get rid of this person, but left his life. This man was none other than Sima Yi, who was later promoted to Wei Shi. According to the Book of Jin, Cao Cao once said to Cao Pi, "Sima Yi, as a non-human minister, will anticipate your family affairs." Then why did Cao Cao leave Sima Yi alive?
Having said that, some people may say that Sima Yi was born in Sima's family in Wenxian County, Hanoi, and is a real aristocratic family. Moreover, Sima Yi's father Sima Fang also recommended Cao Cao. In addition, Sima Yi himself, as well as his brother, are famous, known as "Sima Ba Da". In this case, it is very normal for Cao Cao not to touch him easily. However, at that time, another person, whose background was not worse than Sima Yi, was easily executed by Cao Cao. He was none other than Yang Xiu, who was born in the four-body, three-fair and respected Hongnong Yang family. Some people may say that the family power behind Sima Yi should not be the reason why Cao Cao left him. So, why on earth did Cao Cao do this?
First, Cao is low-key enough to catch him.
Although Sima Yi was born as a "non-human minister", he did control the state affairs, overstepped the Wei family and was disloyal. But before the change of Gao Pingling, especially before Cao Cao's death, he kept a low profile and forbeared, leaving no excuses. Cao Cao did dare to move, but for no reason, he would directly destroy each other, but he couldn't. Instead, it may directly push against Sima's family, which is not worth the loss. If Sima Yi was as arrogant as Yang Xiu when he was under Cao Cao, and even directly speculated on Cao Cao's mind, Cao Cao would not keep him.
Second, stand in the right team.
In addition, Cao Cao got rid of Yang Xiu, on the one hand, because of his suspicious character, and on the other hand, because he chose xelloss as his successor, so he wanted to pave the way for xelloss, but Yang Xiu insisted on's side. That is to say, to some extent, Yang Xiu was killed for the same reason as Zhou Buyi was killed. Sima Yi, on the other hand, stood firmly on Xelloss's side. Cao Cao had to show some respect to Sima Yi in order to let Xelloss take over the later affairs better.
Third, believe in xelloss's means.
Furthermore, although Cao Cao has been paving the way for xelloss since he chose xelloss, he is also a strict father. For example, when Cao Pi was young, he was in troubled times. In order to ensure the safety of Cao Pi, he did not arrange a large number of bodyguards for the other side, but personally taught Cao Pi to ride and shoot, and let the other side learn fencing, making Cao Pi a "master." In terms of employing people, he also adhered to the principle that Zhou Buyi was assassinated, which he determined could not be controlled by Cao Pi. Yang Xiu, who had the ability to pose a threat to xelloss, was killed unjustly and supported xelloss, but Sima Yi, who was ambitious, only reminded xelloss and did not interfere too much. He believed that as long as Cao Pi was careful, Sima Yi would be suppressed.
Later, during Cao Pi's reign, Sima Yi never did anything wrong to Cao Wei, nor did he make a splash. Unfortunately, Cao Cao didn't expect that Xelloss died young after only seven years in office, and Wei Mingdi Cao Cao, as a monarch, didn't live long, which gave Sima a chance.
From the whole analysis, we can easily know that Cao Cao is a suspicious person. He also saw through that Sima Yi did not get rid of Sima Yi, not because the family behind Sima Yi frightened him, but because Sima Yi did not leave a handle, and the position he chose also made it inconvenient for Cao Cao to intervene. Of course, Cao Cao believes in Cao Pi's ability, which is one of the important reasons why he did so.