Lukaku doesn't want to return to Chelsea no matter what. I don't think that Potter's arrival will change anything because Lukaku's problem wasn't with Tuchel actually. He just loves to play for Inter and he likes to live in Italy. In the circumstances it is too difficult for Chelsea to convince him.
I know that he is a temporary player at Inter for now but he would do his best to convince them to sign him permanently. As he is coming back from an injury soon we will see how passionate he is to stay.
His situation at Chelsea does not appear to be improving, he admitted. His goal is to return to Inter as soon as possible as a permanent role. It would even be acceptable for him to lower his salary in order to make a return to Italy a reality. Inter Milan, however, refused to meet the Blues asking price due to their spending restrictions. Since it's impossible to let players leave, Lakuku won't leave.
Lukaku's problem was majorly with Tuchel, Tuchel made Lukaku to struggle, play him off position and benched him when is was inform. Tuchel has a problem in his coaching style, he defend alot and makes defenders to get goals even more than attackers. His style of play is not healthy for any striker.
If Potter can convince Lukaku, he will return to London to play for Chelsea. But the chances are very slim.
Well Tuchel got along quite well with a number of strikers, but I would agree that he is too special at times and players don't get along with him very well.
It is also always a question about success: if you win trophies, nobody is complaining. If you don't but you play nice soccer, everybody still complains. Since Tuchel won the Champions League against Manchester City (not to forget!), he was kind of on the right side of things.
Tuchel's behavior is similar to that of Mourinho. They decide a lot based on their emotions as it seems. If they think someone sucks, they just put him on the bench even if the player is fit and in shape. Despite being such a complicated guy, Tuchel coached some of the biggest clubs in the world by now. I am quite sure though that he will never manage to stay with a single club for more than three or four years. He is a diva and as soon as there is no big success, he will get sacked.