If one thing has become clear over the past few weeks, it's that small margins are going to define this season's Premier League. Over the course of any ordinary title race draws at Liverpool and West Ham might be considered decent results, but up against the relentless excellence of Manchester City only perfection will do.
On Sunday Arsenal were far from that. Having raced into a two-goal lead, the Gunners found themselves pegged back by a West Ham side who had looked dead and buried.
As Jarrod Bowen volleyed home the equaliser, Mikel Arteta turned to his bench looking for someone to change the tide of the match. Despite making five substitutions though, the Spaniard's most proven difference maker remained sat in the dugout.
