Across London, at Stamford Bridge, only Raheem Sterling has scored more than one goal this season. At Arsenal, five players have already scored two or more in eight matches, and one is defender William Saliba.
The 21-year-old has arguably been the Premier League's best player so far this term - Erling Haaland may want a word - and his form demonstrates something the Gunners have seen in him all along. Having loaned the Frenchman out to Saint-Etienne, then to Nice and then Marseille, his development was largely out of Mikel Arteta's hands. His progress has been impressive, though.
There has been high-level interest in taking him away from the Emirates in the chance that Arsenal wasn't willing to use him this season, but Arteta's plan has come together brilliantly and now has one of the most exciting and dominating defenders in Europe on his hands.