It is nearly five years since Robin van Persie’s defection to Manchester United. Having waited so long to adequately replace him, you can forgive Arsene Wenger for at least exploring the possibility of signing Kylian Mbappe. Arsenal have made do with stop-gap solutions for too long, but at this critical juncture in the club’s modern history, the consequences of being led a summer-long merry dance could be catastrophic.