So much of this season for Arsenal will be defined by that they did in the recent summer transfer window. Arsenal were busy in the market over the course of the summer, as there were numerous incomings and outgoings from the Emirates Stadium. There were four first team arrivals in North London, with Mikel Merino, Riccardo Calafiori, Raheem Sterling, and Neto all joining Mikel Arteta’s squad. On top of that, David Raya signed for Arsenal on a permanent basis, having spent last season on loan with the club from Brentford. In terms of exits, accounting for permanent sales, contract expiries, and …