Yes, Chelsea doesn't seem to be too bothered by the problems that befell Mudryk, especially since his contribution to The Blues is still lacking, his performance does not reflect his price, so losing him will not affect Chelsea's current performance at all.
However, if Palmer is in that situation, it will indeed be a big loss for Chelsea because he currently plays a big role in every victory achieved by Chelsea.
It seems that if Mudryk really uses doping, we will see another Pogba.
Maresca is doing every thing that every coach will do, that's what a good coach will do just to protect the image of the club so as he doesn't implicate other players. As you can see that they have been having many bad seasons before now but all of a sudden, the presence of Amorim became a great inspiration but then one guy became a victim doping, even others that are doing well in the club will be suspected and maybe recommend to do similar test just to be sure.
Mudryk might not be too active this season but 15 appearance of 3 goals and 4 assists means a lot, his contributions alone is more than what some teams has done this season in the Premier League. I just hope this doesn't makes the players even scared if eventually there is more victims among the players that are using the same thing to stimulate their body system for high performance in matches, it will break the team of any prominent player is found guilty again.