Yes, I agree with you, the biggest issue I see with the switch from Thomas Tuchel to Graham Potter is that Potter hasn't had much experience with a big club, so he may be a bit rusty as a manager. In my opinion, a coach has to be disciplined and quite strict in order to maintain a big club and big names. Graham's decisions have been shaky from the beginning, and Chelsea have suffered for it.
Since he has not won a game in the last five matches, management is also putting quite a bit of pressure on him.
My hope is that Graham will find out the mistakes and correct them as soon as possible. I think he doesn't have that much time left, as if Chelsea loses some more games, he might be sacked.
In fact, I think Graham Potter performance with Chelsea looked better in the Champions League because fans had doubts when he was appointed as Tuchel replacement due to his lack of experience in the Champions League, but all doubts seemed to be swept away by Chelsea performance in the Champions League. Graham Potter only needs support to bring Chelsea to become the strongest team in the Champions League.
Chelsea, whose finances are good after ownership belonged to Todd Boehly last season, will be very ambitious in the January transfer market, because there are many rumors circulating that Chelsea might bring in Ronaldo to strengthen the squad in the Champions League.