The downturn that befell Chelsea due to blunders made by team management, the decision to fire Tuchel was the beginning of Chelsea downfall. After the change of coach, Chelsea appearance did not improve, Potter, who was expected to improve Chelsea performance, failed to meet management expectations which made him the same fate as Tuchel. Chelsea was only able to finish 12th despite having good player material, when compared to the quality of other club squads, Chelsea is included in the list of teams with a luxurious squad after bringing in players at high prices. .
I still do not understand the reason why Thomas Tuchel was sacked in the first place because it seems to me that Todd Boehly made the decision to sack Tuchel based on emotions, I believe Todd Boehly was no longer fond of the coach and so he had to take him out.. I really hope he has learnt a thing or two from this unsuccessful season and do better in the next one.
I think Thomas Tuchel was sacked because at some point he wasn't getting wind for the Chelsea team which his boss wasn't comfortable with and having in mind of replacing him with a better coach everything became worse for the Chelsea team. I believe Tochel wasn't sacked because of emotion rather he was sacked because much was expected of him which he couldn't deliver and after all, none of the coaches brought back the lost glory to the Chelsea team but now that Pochettino has been employed, it is expected that he will take the team back to the first team where they belong I just hope that he will be given more time and not be sacked after few games.