As the dust settles on deadline day and the summer transfer window, the Arsenal hierarchy will likely be very content with their spending. Riccardo Calafiori was the flagship signing of Arsenal’s summer, a player who Mikel Arteta has preferred to introduce slowly thus far. Although, Calafiori may start in the North London derby, a baptism of fire he seems ready for given his performance for Italy against France over the break – that’s if he can overcome his minor knock. Otherwise, Arsenal concluded a permanent deal for David Raya, welcomed Mikel Merino from Real Sociedad and executed loan deal…