Rosicky seems to be dropping too deep on the counter (not making the runs), and is playing too far up the pitch in possession to hold the ball. If you look at the default position for the centre mid in a 4-2-3-1 the centre mid typically plays high up (Joe Cole for liverpool), but when you need to close a game out, dropping deep just has to be done. That extra man in midfield would really help to run down the clock, as I hate being an Arsenal fan with a 1 goal advantage with the last 15mins coming up