arsenal has a target stop in the top 4 is very reasonable IMO. Arsenal's opponent in the EPL match is Brentford and most likely arsenal will win but after that arsenal will face Tottenham and Liverpool, I'm not sure if arsenal will be able to maintain their position in the standings while man city continues to follow from behind with great potential to shift arsenal's position.
Top 4 will always be Arsenal main target for each season because they miss to play at champion league again and their last appearance on this competition was 2016 and since that Arsenal never reach to top 4 again and one thing for sure Arsenal should be consistent because this is one of the biggest issues since Arteta arrived that they seems always have late start compare to other big teams or playing not stable and if this season they can showed their consistency i am sure their target will be achieved and next month will be tight schedules for Arsenal because besides Tottenham and Liverpool they also will fight against Man City
It is very difficult to maintain 4th position in every season because the opponents they face are very tough they must maintain teamwork to maintain their defensive position and when there is an opportunity to attack to score goals, they must be utilized properly and maximally because in the previous match they failed to survive and had to lose to Manchester United, Hopefully in the future Arsenal can still get a win.
The defensive midfield position has a strong mark on Arsenal playing system; their transitioning, attacking building and defensive compactness. Arteta is a very stubborn and insensitive manager. He lost two of his best Defensive midfielders to injury before the Manchester United game and the win down was still open to bring an experienced one in to fill that position. Facing Manchester United, the lost the midfield which as a result drew out their central defenders to help in the midfield. That was how Manchester United did the destruction by counter attacking the high line kept by the Arsenal defenders. If there was a defensive midfielder. There wouldn’t have been any need for the defense to draw out of position to assist the midfield.