Toure was vastly over rated last year, there were many times he was completely unplayable, but there were a minimum of a dozen games he was knackered by not long into the second half, did nothing defensively, and admittedly in a couple those games he'd save all his energy for one devestating burst forward, effective largely because at those times he was knackered and barely moving would tend to see City put under pressure and that plays into the runs out of nowhere counter attacks pretty well. Though I do agree, he's not managed to be that driving force this year.
Silva, they don't miss him though, the biggest issue for City was Silva disappearing. When City are playing well and Silva has time he can put in some magic passes, when the team is under pressure and they need a player to step up, hold the ball, make a play and fight with less numbers up the pitch.... he's no where. CL last year, him and Nasri disappeared in games like those. It was Yaya at his best driving them forwards that would drag them out of a bad performance, never Silva. The way City are playing currently its the drive forwards they seem to need, not Silva. Personally I don't think Silva would make a tiny bit of difference at the moment, they need some pace/guile on the wings and well, when Toure isn't holding the team together, Barry isn't good enough to step up and do, well, anything.
Mancini blamed the players for every mistake last year, he's doing it more, he has the cheek to call them out as not being top players if they aren't perfect at a system they've never played and he won't practice. Performances are going backwards and turning on your players(now with the whole squad knowing full well he'll " do a Tevez" to anyone he decides to turn on next, I can't imagine the players being too happy).
ANyway, the press are probably making it up, but all talking about Guardiola's agent talking him up for a job next year. Considering they bought in his previous bosses while at Barca the papers are putting two and two together and decided City are building a management team Guardiola would like to work with.