Aguero's moment of brilliance is when he took the shot which caught Cech out, not on timing his run. And if you want to talk about timing the run and praising Aguero for it, then the opposite should be thrown at Cahill for his non-timing to set the offside trap. Also, had Cahill been aware of his position, the other 3 defenders that were already ahead of him and Aguero's and positioned himself better, the goal wouldn't even have happened.