#3 Simeone can sort out their defence
Arsenal have conceded 40 goals to date this season. To put that into perspective, Liverpool with all their widely acknowledged defensive frailties have conceded only two more goals having played two extra matches. Arsenal's defensive issues are particularly exposed against teams that press aggressively and intimidate them physically; not to mention set piece woes.
Diego Simeone took charge of Atletico in December 2011; in 2010-11, Atletico had conceded 53 goals in the league, and in the 2011-12 season, Atletico conceded 46 goals in the league. Over his first four full seasons in charge, Atletico Madrid then went on to concede just 31, 26 (title winning season), 29 and 18 goals.
Just 18 goals conceded over 38 matches – and four of them in two matches against the imperial MSN! Attack wins you matches, defences win titles – and a manager like Simeone moulds defences that win titles.