To me I don't really think the players or the coaches are to blame, who is the major cause of the struggling of Chelsea football club is the owners, they have practically reduced the club to an average club, why would they be buying young star that haven't been proven for a very large amount of money against the manager wish, and to make matter worse, they have practically interfere in every decision of the manager, and that is the main reason Thomas tuchel was sacked, because their was a pushback from him, he refused to concur to their style of doing things, so he was sacked.
Ok let's look at Mauricio pochettino, he took the Chelsea job as a yes man. initially they told him that he wouldn't have a say on who goes in and out of the club, and he agreed, but toward the end of the season when he kicked against the idea of selling Gallagher, he was sacked, so with this type of leadership, I don't see Chelsea achieving anything big, because their is too much interference and the owners wouldn't let his employees to do their jobs.
Yeah, with Chelsea current management is bringing serious trouble with this Elite Premier League club and as in current season many were feeling things are coming back to normal we are having another setback which is huge because sacking of Mauricio Pochettino is surely going to have big impact on their performance in coming season and things could be not at this level we will have decline which is going to be not ideal situation.
Chelsea current management doing things which are surely not good for having improvement in performance they are trying to change their business model as bringing new youngsters and selling them on high price which is completely different thing with their model which was run by Abramovich who soccer lover was and love to win trophies instead of having things like these which are done by current management.