This is the worst part of the call. It wasn't like he just moved into that position, he had been in an off side position for ages, and makes no attempt to get back on side. Can almost see how surprised he is when he looks back at the linesman after the goal.
Agree with bigfella and Mick on the penalty situation. He leaves his leg in so much it's almost a free kick to us because he kicks Mbemba. Would have been furious (but not the least bit surprised, obviously) if that was given.
And the excuse given was the Lino might have thought Toure headed it. Two things about that, firstly the lino should have seen all the players going to Aguero and secondly, and most importantly. Aguero moved back into the same area, heading it or not that should be given offside. It's just a rank bad decision.
Even if he thought Toure scored he should have had his flag up then said to the referee that Aguero was offside but not interfering with play if Toure scored. The referee would have then been able to turn around and say actually Aguero scored and then ruled it out. It's better to stop and talk to the referee then to just sit there.
Doesn't matter if Aguero scores or not with the new rules in place for this season. It's off side if he even attempts to go for the ball.
And he wound up half a yard from Toure anyway. You can't be not interfering at that distance.