More than limitations, I think it is coaching. I did see the game yesterday and it was refreshing to see an Arsenal team work hard without the ball. Ramsey and Chamberlain and Coquelan were exhausted at the end of the match - and rightly so - they had spent the whole game covering the city players and any spaces.

You mention Barça. Under Pep, we had a 5 second rule - try and win the ball back in 5 seconds or fall back and more often than not, pressuring the ball high allowed us to create clear chances if we won it back.

I have also seen Chelsea play this way this year. OK, they don't have Messi but they force a lot of mistakes by pressing high but they also know when to fall back and let the opposition come to them. Bayern do it too - obviously because of Pep.

It takes a lot of training, discipline, concentration and then hard work to be able to do this every game. If one player decides to take a rest the system does not work.

A lot of it comes down to personnel. A lot of energy both in the middle and out wide yesterday worked wonders - not sure Arteta will start a big game ahead of Coquelin again