You have to put it in a bit of perspective. Tevez was an amazing player for Boca. He was very young and not their main cog. At West Ham they used him more sparingly until the end of the season. At Corinthians he was the main man more or less the entire time he was there. The goals flowed. Goes to United and he isn't handed as central a role. Comes to Man City and again is the main man. The goals flow again. Great player. United didn't deploy him with as much freedom as City has done. Their loss. City's gain.