Toure, and Silva to an extent, have only been able to do what they do thanks to the foundation he has layer down in their midfield. I remember how average thee guys looked with Fernando out there last year, and the difference is night and day. Fernandinho is what their title winning season was built on two years ago, and it looks the same this season so far with the rest in shape. Silva, and even tour against the smaller sides, don't have to put much worry into defending because they have a mobile rock in the midfield. It completely changes the complexion of the team.