Attacking Midfield
The German player formed a formidable partnership with Alexis Sanchez previously. Now, he has Mkhitaryan playing alongside him in midfield and Aubameyang upfront. His ability to see passes, drive the ball to its target accurately and create goalscoring chances makes him an invaluable player for the team.
Without him playing, it is difficult for the team to create anything towards the goal. Against strong rivals, Tottenham, the Arsenal team will be trying their best to get the ball to him.
Left Winger
The former Manchester United player made his home debut over the weekend and it had been spectacular for the fans. If Mkhitaryan is able to perform at a consistently high level, Arsenal will surely benefit from the transfer.
At the same time, he and Aubameyang were once team-mates at Borussia Dortmund. Now playing in the same team once again, this upcoming match will a test of their partnership.
Right Winger
Since Wenger's tactics against Everton worked out well, I doubt Wenger will replace this man. He is one of the most hardworking players in the team even though his efforts often go down the drain.
After a poor run of form, Iwobi has since stepped up his game and can be seen playing better in recent games.