Its a strange one for sure. I mean, if he work hard in the training sessions and actually provide anything when he gets the chance in games he will ofcourse play. We play the best team because PL is so competitive.
In Bayern they have space to play talents until they develop or just to rotate the squad because the quality of the league is so low compared to the team they have. So yeah CHO will have more playing time in Bayern probably develops better there.
You can put it this way: He is not good enough (right now) to develop in a Chelsea shirt at the moment.