The resignation of Arsenal's sporting director Edu on Monday appeared to catch everyone at the club and in the wider game by surprise.
As recently as mid-September, when Arsenal announced a new long-term contract for head coach Mikel Arteta, Edu went on record about his "strong belief in what we want to achieve together" and, as one of the 'Invincibles', he felt far more emotionally-invested in the club than your average ambitious executive.
