Of the many failed transfers that Chelsea have made, perhaps Mudryk is one of the most fraudulent investments they have ever made. It was a wise choice to let go of Mudryk, maybe some of the money could be returned even though Chelsea had to accept a huge loss. Mudryk may have chosen the wrong club and the timing wasn't right, because currently most of Chelsea players are filled with young players who can't help him develop for the better.
If Mudryk joins a mediocre club, maybe he can get more playing time, calculate to hone his skills to become better. However, it looks like the Blues will have difficulty cashing in on the winger, because his price is very expensive and his salary is also very large. An alternative solution that the Blues management might use is to loan Mudryk to another club, with a permanent purchase option in the end. Personally I still don't understand why Chelsea recruited him, plus the price is very expensive.
At the moment I don't think we can refer to just one player because looking at some of the players Chelsea have bought almost all of their players cannot make a good contribution and that doesn't just refer to Mudryk in attack but for midfield like Enzo or even Caicedo's expensive purchases to date have had no impact.
I personally only see their most successful purchase this season is Palmer alone and not for others.
There are so many players who are considered very good players and bought very expensively by Chelsea who cannot make a good contribution.
We may know that Nkunku, Enzo, Caicedo and even Lavia are among the players who have good progress if you look at their performance at the previous club but when they are at Chelsea it becomes very bad and like losing control of the game they do until now.
But with so many players failing at least we know that this is not the fault of the players but indeed it is Chelsea's management who cannot utilize their performance which makes the players' performance decline.