The problem with City is Tevez, well not a problem but the main reason why the system is little bit of. Tevez is an amazing player and your best player. But he's also free spirit. now before Dzeko Mancini could play him upfront and has the team shaped behind him, it work really well as the team was really tight and strong defensively. But the problem was as he came too deep alot of the time and City struggled at times because there wasnt enough people in the box.
The idea to bring Dzeko is great as it means the team will have a vocal point and someone who's always in the box and can mae opposition centre halfs drop deep and occopy them. But the system behind Dzeko gets little bit messy as you cant play Tevez in either wing and expect him to stay there, you could play him behind Dzeko, but that means Silva has to go to the wing and the three man midfield Mancini loves will get broken up. So he needs to find a consistent position for Tevez and he needs to be disciplined for City to become stable again. But the problem is Tevez strength is when he has freedom and pops up everywhere