I think you're conflating a drop in form from world class players - Haaland, KDB, Foden - with the hit-and-miss performances from on-the-fringe players trying to break into our squad (Doku, Savinho, Gvardiol).
The difference being - that the world class players we have are consistently excellent - whereas many trying to break into our side - have been hit and miss throughout with no consistent spell of excellence.
Doku was my MOtM this last game. Next game, should he start, who knows? I've no confidence yet in his ability to consistently deliver high quality play.