Episode nine of 'That Sums It All Up' sees my lovely guest (Johnny Rosen) and I deal with Arsenal's 2-0 defeat in the North London Derby.We discuss: the worrying ease with which Spurs scored both their goals, Arsenal's tactical naivety, why Mikel Arteta didn't revert to his tried and trusted 'big game' system, Thomas Partey's injury incident & our yet again underwhelming attacking style.And of course, the discussion inevitably leads into some of the bigger questions: is Arteta's job on the line, whether the club can afford a mid-table finish & why more generally there is serious cause for concern for Mikel Arteta at Arsenal right now.My Twitter: https://twitter.com/alfiesteiner1Johnny's Twitter: https://twitter.com/johnnyrosen1