It’s the same paradigm as Kinkladze. Look at the careers they both had after they left City (in their purported prime) to provide objective proof of their genuine quality. Both were great for a period when they were here, and as supporters that has huge currency, but when the debate moves to a wider sphere, their subsequent achievements (or lack of) provide clear evidence against any assertion of their greatness as players, especially given injuries haven’t played a significant part in that.
Loved them both when they were here, but logic dictates that they are both overrated by some blues.