At what point does Aguero leave little City?

You could say the same about Rooney. Obviously Aguero hasn't declined as pathetically as our talisman, but he's nowhere near the player he was a few years ago.
He's scored 24 goals in 30 apps last season and 11 in 18 this season and that's only in the league. I wish Rooney declined like that.
 
Something similar happened with us with Van Nistelrooy if you remember. He clearly was one of the best strikers in our history, yet it became clear that the team functioned better with Saha and later on Tevez. What they brought to the team in terms of overall fluidity outweighed their goal ratio inferiority. Just because someone is brilliant at a specific part of the game does not mean they will fit into every style. We can just hope they don't go on to achieve the same success we did in that period.
I can kind of understand it about RVN but Aguero has much more to his game. You'd think he could adapt to any system.