Last season’s FA Cup triumph over Chelsea was supposed to herald the start of something special for Arsenal Football Club and Mikel Arteta. Instead, it's the Blues who have taken a huge step forward under the influence of Thomas Tuchel, with a return to the FA Cup final one year on and a UEFA Champions League final in their wake. Arsenal meanwhile have spectacularly regressed toward mediocrity, hovering in and around the likes of Leeds, Everton and Aston Villa.