Why did Ma Chao remain unknown in the late Shu and Han Dynasties?

I have made it clear about Ma Chao's life upstairs, but what I want to say is that Ma Chao is not as depressed as you said. On the contrary, Ma Chao was probably the most important warlord in Shu and Han dynasties. Think about it. After the establishment of the Shu and Han Dynasties, Guan Yu, Zhang Fei, Ma Chao, Huang Zhong (Zhao Yun didn't), Zhang Guan and Liu Bei's righteous brother, Ma Chao ranked third. It fully shows that Liu Bei attached importance to Ma Chao, and there was no shadow of Ma Chao in the later major battles, but this happened when Ma Chao was guarding Zitong and fierce ethnic minorities in the west dared not attack.