Nobody, literally nobody after Thomas Tuchel actually brought in good results with Chelsea in my opinion. Thomas was actually doing well with Chelsea. I believe he finished fighting with Chelsea when he was lost in charge. After that, they brought in Graham Potter. For better results by the way, because they were not satisfied with the results, Chelsea was bringing in. And they brought in someone who was not well known, even though they had an option of bringing in Zidane.
And from that moment, everything started to go bad for Chelsea. And if anyone says that after Thomas Tuchel, anyone has actually done well with Chelsea, I will have to say that he is delusional and cannot relate with reality.
At least Thomas Tuchel has made Chelsea in the best performance and even won the UCL title, but regarding the ups and downs of a team's performance is a natural thing, but Chelsea's new management made a big mistake last season.
As a result of their own actions, they now have to spend a lot of money to rebuild this team from scratch, bring in new coaches and many new players at quite expensive prices, but until now there have been no results, they are still in a slump.
That has passed, now Chelsea has returned with a new look, new players, new coach and now we just have to wait for their comeback, I think they just need time slowly to get back to making this team at its best, sooner or later it will come.