Both teams were a shambles on defense in the first half. Of course that is to be expected if David Luiz is your central defender, although he wasn't really at fault on the Arsenal goals.
I don't understand the roles of Kante and Jorginho and it clearly did not work in the first half as the midfield allowed the Gunners several great opportunities. Kante's strength is as an endlessly persistent defending midfielder. Kovacic looked good when he came on.
It's very early, but such an expensive goalkeeper probably should have saved that first Arsenal goal.
I'm enjoying the Brighton-ManUre game this morning.