Now the dust has somewhat settled on Arsenal’s transfer window, it’s hard to quite decide whether it was a success for Edu and Mikel Arteta. Arsenal signed some exceptional players, the likes of Riccardo Calafiori and Mikel Merino, two players who will definitely improve Arteta’s squad immediately. That may not be true of Merino right now given his frustrating injury, but in time the Spaniard will make a big contribution to Arsenal’s title push. That being said, Arsenal failed to sign a flagship player – they didn’t welcome another Kai Havertz or Declan Rice like the summer before. Perhaps tha…