Emperor Wu of Jin was extremely clever, and completed the inheritance of three generations of grandparents and grandchildren, and moved Wei to his home. However, as far as ability is concerned, he is also a talented person, but his successor, Jin Huidi Sima Zhong, is a famous retarded emperor in history and is notorious for "why not eat minced meat". Let me talk about the necessity of Sima Zhong being emperor. Sima Jia's reputation in history has not been very good, because it is well known that Sima Jia was a family thief who usurped the power of Cao Wei. The Cao Wei family who had been grateful to Sima Jia was driven away by Sima Yi's Sima Shisi Ma Zhao.
Therefore, it is impossible for the Sima family in such a country to preach loyalty to the monarch and govern the country. After all, the Sima family itself is very disloyal, and it is impossible for Sima Yan to do such a brazen thing. Therefore, he can only change his course and preach the rule of filial piety.
So Sima Zhong, as the second son of Sima Yan, basically had to be emperor. Only when Sima Zhong became emperor can he tell the world that many brothers in Sima's family are close friends and harmonious, and the whole family is very filial.
It is also for this reason that Sima Yancai made great efforts to enfeoffment his relatives and brothers, which can also prove that Sima Jia is filial and takes care of his brothers. Since then, the Eight Kings Rebellion has also begun.
There is no doubt that Sima Zhong himself must be very incompetent. If he were a wise emperor of SHEN WOO, he wouldn't be manipulated by so many princes. However, I think Sima Zhong's relatives have smeared his character. This is actually the same as Sima Yan's explanation of the legality of one of his disturbances.