The key to the problem between Cao Cao and Yang Xiu is:
1. Yang Xiu privately participated in Cao Cao's affairs and committed political taboos. Acting spontaneously in character, not knowing the forbidden area, Yang Xiu was killed mainly because of his involvement in Cao Cao's affairs. It was right to kill from Cao Cao's standpoint.
2. Yang Xiu has no political acumen, has repeatedly made headlines, spread gossip, and as the leader of the march, this is the suspicion of deceiving the public and leaking military secrets, which can be a big or small crime.
3. In terms of small wisdom, Yang Xiu has a talent, but it is completely possible to arrange another appointment, so that he is far away from the political center, and can engage in education, editing, and studying and governing, and it is the best policy for people to make the best use of their talents.
4. Yang Xiu is the nature of a literati, not belonging to politics, officialdom, and even less aware of the sinister nature of the officialdom, he has no wisdom in this regard
The relationship between Cao Cao and Xu Shu is:
1. Xu Shu is just "Xu Shu entered Cao's camp without saying a word", and did not advise Cao Cao, but there was no negative harm.
2. Although it cannot be used by Cao Cao or used by opponents, there is a certain value in doing so.
3. Not killing Xu Shu is for Cao Cao's own reputation as a love talent, which is beneficial to himself.