Aguero clearly has talent but in my opinion there is absolutely no way his next 2 season can be better than Tevez' last 2 seasons, so City will be weakened. Unless of course a side benefit of Aguero is that if Tevez stays he will have his fellow countryman alongside him to try and keep him.
In terms of the thread it's irrelevant as the players chosen are supposed to be already playing in the Premiership. Aguero hasn't even been signed yet!