But you need to look from bigger picture.
CHO just turned 20. Already scored 10 goals for Chelsea plus 11 assists. This season when he started in Russia and against Palace he had good games. Also great 45mins against WBA in the second half when we scored 3 goals.
In other PL and CL games he got 1, 15, 10, 17 minutes. What can he do in that time? In Carabao Cup he was not good but not terrible either.
Do not forget he played just around 3000 minutes in pro football. Mount for example played more than 11k minutes. This is more than 2 full seasons. What is going to be his level in 2 or 3 years?
He and James are two players worth waiting as much as needed. If we ever have Salah, KDB situation it is most likely going to be CHO.