He’s our most important player, which is the problem - nobody else in the team can operate in the role he can currently (Delph lol). And no, as a dirty bastard who can break up opposition attacks, he’s no longer particularly effective.
I could easily see Stones stepping into midfield long term in the same way Lahm did, but that intensifies the problems we have at the back. It comes back to the same thing - City have invested massively in attacking midfield whilst doing nothing about the problems at the back which have been obvious for several seasons now.