valuing Leno over Martinez was a case of misplaced loyalty and nothing else - in the old days if a player - including the goalie - was injured and the stand-in did better, then they remained in place even after the other player recovered.
i'm old enough to remember Fergushite being single-minded enough to drop the goalie Jim Leighton for the reply of a cup final after he messed up in the first tie
i hate fergushite but he always kept his eye on what was important - for example playing kids in nothing cup games, whereas both Emery and now Arteta commit too many of our 'better' players
we need some of that single-mindedness - Arteta's teams are loaded with teacher's pets and bad buys from Kia Joorabchian which he then has to do something with