I have read this post and have found myself nodding my head to a lot of the comments, great discussion happening here.
In my opinion Pellegrini is a really exciting prospect, I look at the way certain teams around Europe have been playing such as his Malaga, Ajax, United and without a doubt Dortmund, and tell myself this is just efficient football. They use pace on the wings, creativity (short passes) through the middle and have the striker make great runs through the middle taking their chances. However I think Manuel might not be needed and all Mancini needs to do is change his football philosophy.
What many have observed which has been very common this season (painfully shown against Wigan), is City slowing down their play to do these passes back to Yaya then out to the wider players such as Nasri, Clichy, Silva and Zaba then City losing possession when a shot is taken or Aguero is dispossessed, because the opposing team has been given time to set their 2 banks of 4 defenders...
I'm not sure if Mancini implemented this or he has been told to play this Tika-Taka football style but its hell as sure not effective. If we have a player such as Messi we can do this however for us its just so labored and this has without a doubt been shown in Cities past two Champions League campaigns. To get the best out of Kun we must play faster football and have other players drag defenders away from the striker...
This is why we need wingers! A team which has set the Europe alight and ripped up their respective league this season (Bayern) do play the style we kind of do (with possession based football) but instead of over passing in around the opponents penalty box, they have two blazing wingers pulling the defenders away from the goal and creating chances, not improving their passing rate percentage!
A problem for City if we do buy a winger in the upcoming transfer window is our problem is always trying to play with 2 strikers meaning as someone said before Nasri, Silva, Milner are going to miss out. Its not being effective at the moment and I cant think of top teams in Europe atm utilizing this system, United where the closest it seems Kagawa (or someone else) is going to play behind RVP in the future and with Rooney most likely on his way out.
With all this said, I'm really gutted for Mancini and I just wish he has one more season to save himself and show his haters what he can do....