Have Arsenal peaked or plateaued?

Arsenal scored 4 in midweek in the Champions League, and are 4 points clear at the top of their group table.

Since losing away to Man City 4-2, Arsenal are unbeaten in 12 matches (League, League Cup, and CL). That includes 10 wins, three matches in which Arsenal have scored 3 goals, two with 4 goals, and one with 6 goals.