If Chelsea can give Graham sometime I think their will be good result. Chelsea has never believed to give a coach chance to see if their will be a good result. Chelsea is too quick to sack their coaches when their performance is poor.
You need to blame the owner for that. Chelsea would give a chance anytime but the problem is sometime the owner of club wanna try to intervening the decision that made by the management and so the decision can't leave from opinion by the owner.
Tuchel leaves caused by todd wants it and that's why the management can't do that to prevent him to leave from the club as todd was forcing the management to sacked him. Potter itself has become an over rated coach for chelsea.
He came from the medium tier club without any achievements so far. that's why i still prefer tuchel over him in this case. The problem is owner was too harsh to control the team based on what he was thinking about.