I would even say that all the top players who are at Chelsea this season are normal if they don't play to their fullest because the club's condition is not very promising overall. This has had an effect on other players who have received a lot of criticism because they are considered unable to help the club to slowly develop and improve their overall performance. Maybe our views will differ when we see the team playing well but the players don't show anything good, and that's normal when they get a lot of criticism because of their individual play.
No, even I don't blame the coach. I think it should be the management and the new owners that we should blame. They choose coaches who do not have the best experience and ability in managing star players. Potter was good at Brighton but bad at Chelsea. Lampard, he was at Chelsea but also has no improvement after handling the rest of the season. The new hope next season is Mauricio Pochettino. He doesn't have many trophies, but I think he's better than Potter and Lampard.