Why is Wuhu in Mazhuang stronger than Ma Zhuang and unable to destroy the Eastern Jin Dynasty?

In the north, Hu Jie is the most powerful, but that doesn't mean it is completely controlled. There are still many Han aristocratic families in the north who built their own castles to defend themselves. There are also a large number of Han Chinese in Hu Jie's army and a large number of "begging troops" in the north (that is, refugees unite to protect themselves). This is why Ran Min killed Hu Ling Hu Jie and was soon killed. These Han troops only seek self-protection, have no political demands and are not United enough. As long as the Han people make propaganda and give them a practical political goal, such as official positions, they can't beat Hu Jie if they unite. Since ancient times, Han people have been bullied because of disunity. Han people have loved infighting since the Three Kingdoms.