Isn't the definition of insanity is doing the same thing over and over again, but expecting different results? If each and every player is below form, then maybe the blame is on the tactics but not the players.
The main problem with Silva is the lack of development both on team play and individual aspects. The man is too stubborn. He can't offer solutions to the obvious problems. After three transfer windows, there is no excuse for that kind of failure.
Dominating possession is one thing, getting chances is another. Lots of pointless passing in the middle, slow tempo, lack of buildup play results in a passmap that bleeds eyes. How can a team succeed with that kind of positioning?
Pass wide and cross. Repeat.
Lots of posession but no point to it. It's getting beyond a joke.