I remain unconvinced that our improvement had much to do with the formation change

[redgunamo]

Something about it resetting the mind-set of players too, perhaps. The formation alone doesn't explain how they were suddenly winning balls, 'snapping into tackles', as they say, and roughing opponents up.

Right. It's the way a manager can show them what his priorities are this week. I doubt Wenger would even mind the goal Manchester City scored too much.