Zhuge Liang has killed two high-level generals, one is Ma Yan and the other is Wei Yan, to be honest, both of them are quite wronged.
Ma Tan's death was Zhuge Liang's own mistake, Ma Jian is a bit clever and very sensitive, and his suggestions are all in line with Zhuge Liang's thoughts. After the Five Tigers lost this basic disk, the talents of the Shu Han regime withered even more, so Ma Yan, who catered to Zhuge Liang, got the opportunity to rise and was entrusted with important tasks. Then he pulled his crotch directly, and his performance was consistent with Liu Bei's opinion on this person. Ma Jian was an old man under Liu Bei, and Liu Bei looked down on him, but Zhuge Liang was unavailable at that time. And after Ma Tan was reused, he immediately let himself go, made his own opinions, and ruined Zhuge Liang's big thing. In fact, with Ma Yan's talent, it is not good to be alone, but he can do a good job conscientiously in the position of second-in-command, and Zhuge Liang uses him to lead the army, which is really inappropriate.
As for Wei Yan, Liu Bei was very optimistic about him. After joining Liu Bei's camp, he has repeatedly made military exploits, and is a rare military talent who stands out by virtue of his military exploits in addition to the five tiger generals. In the novel Romance of the Three Kingdoms, Zhuge Liang was about to kill Wei Yan when he saw him for the first time, but was stopped by Liu Bei. Wei Yan's death was not so much a plot by Marquis Wu to cut off the potential threat of the Shu Han regime after his death, but rather that Wei Yan thought that the opportunity had come after Zhuge Liang's death, but he was destroyed by his colleagues in time after the death of Zhuge Liang, avoiding a civil war between Shu Han generals. But it was attributed to Zhuge Liang to avoid suspicion, otherwise we would have to take the trouble to explain to the emperor why we should be infighting. This is simply what the prime minister arranged before his death, and everyone thinks it is reasonable.
Wei Yan joined Liu Bei's camp with his private soldiers, which was originally a small group with strong independence. With the accumulation of military exploits, the strength has risen even more. The basic plate of Shu Han is very small, and it can't withstand the internal friction of the mountains, Cao Wei and Dongwu can let the existence of the valve family exist, but Shu Han can't. Fear of internal friction is one reason, and more importantly, the key basis for the Shu Han regime is the orthodoxy of the Han family, and Wu and Wei are all arrogant. Even if the Wei State is replaced by the Sima family, but the people don't care about the change of dynasty. Shu Han can't do it, any surname other than the Liu family becomes the lord of Chengdu, and the only political correctness to unify the world is gone. Although Liu Bei himself is mentally prepared, the general trend of the world is already like this, it doesn't matter who will be the head of this local government, you (Zhuge family) can come.
And Zhuge Liang wants to revive the Han family and help the surname Liu restore the world, so he can't tolerate any surname to become bigger. Wei Yan can be regarded as hitting Zhuge Liang's biggest obstacle, no matter how capable you are, you can't do it. When I am alive, I can still control your energy for my use, and do things for the Shu Han regime, I am going to die, no one can control you, I am embarrassed to do it. Wei Yan is much more flexible than Jiang Wei, if he is consumed with Cao Wei, he will kill two birds with one stone. There can only be two results, Wei Yan wins, will stand on his own, and then eat between Wei and Han. If Wei Yan loses, he will surrender to Wei, and then counterattack Shu Han. Instead of betting that he would die on the battlefield, it is better to clean up himself.