Having signed Riccardo Calafiori, Arsenal are evidently on a mission to improve Mikel Arteta’s squad depth heading into the new season. For two campaigns in a row, Arsenal have come up slightly short of Manchester City, not able to match their momentum during the all important run-in. That being said, many believe that Arteta has simply lacked the squad to compete with Pep Guardiola across a long season previously. For example, William Saliba played every Premier League minute for Arsenal last season, and players like Bukayo Saka and Martin Odegaard won’t have been far behind. Arteta did have …