Because it took just 90 seconds for his own City team to expose just how bad things have got at the Emirates since Arteta left just three years ago.
Fernandinho was able to break forward 30 yards past four disinterested Arsenal players to knock the ball forward to Gabriel Jesus. He, in turn, should always have been second best to Calum Chambers, but somehow managed to get to the line and pull the ball back.
There stood Kevin De Bruyne and bang! The Belgium international’s incredible technique enabled him to side-foot a rising ball fiercely just under the crossbar to set City on their way.
Of course, De Bruyne was not finished there. Playing ostensibly in the No 10 position, he was popping up everywhere.
In the 16th minute eased past Lucas Torreira in midfield, kept himself in front of three red shirts forlornly chasing him and picked out the only City player in the box, Raheem Sterling, who converted with ease.
