Su Yu
When the Korean War broke out in 1950, it was rumored that Su Yu was the commander that Mao wanted to lead the Chinese People's Volunteer Army into Korea, because of his experience of commanding a large number of troops. However, because of his illness (caused by shell fragments in the 1930s), neither Su nor Lin Biao (also rumored to be sick) was able to command the CVA. In the end, Peng Dehuai was selected.