Arsenal thrashed Bayer Leverkusen 4-1 in the Emirates Cup in a superb display, but there were some notable absentees. Despite having several left-backs in the Arsenal squad, Mikel Arteta found himself short of options in the position. Takehiro Tomiyasu and Kieran Tierney have missed the entirety of pre-season, but even Arteta’s new options were unavailable. Jurrien Timber picked up a minor problem after coming back from a long-term injury, which kept him out of the final friendly of the USA tour, whilst new signing Riccardo Calafiori was not even named on the bench, despite being at the Emirat…