Well, few months ago you've shat all over me for saying he'll never be old Zaba again . You said he's just came back from injury and will be back in few games, so not sure you've got much objectivity in this case.
Zaba is finished for top level, last season was a hint, this one just confirmed it. He's nowhere near what is required for a team of City's caliber. Sagna, who is 34 and few years older is twice better player currently.
Zaba is legend but he's done and I doubt he has much of City's future left.