#2 Fatigue causing the problems for Arsenal
Two back to back big games for the Gunners left Unai Emery in confusion. But he handled the situation pretty well and won 4 points out of 6 against Tottenham and Manchester United, which is indeed brilliant.
Tottenham was thrashed at the Emirates, and Arsenal's star man Aubameyang was breathing fire. However, he did not have many contributions in yesterday's game. You cannot ask much from a player who is starting 2 games in a matter of 4 days.
With Ozil out injured and Granit Xhaka suspended, the midfield options were less as well for the Gunners, forcing them to rely on the 19-year-old Matteo Guendouzi, who absolutely bossed the midfield, although the lack of a strong and tall defensive midfielder was visible.
Arsenal plays Huddersfield next at home, and I won't be surprised to see a majority of the starting eleven players to be benched.