The race for the last spot of top 4 will be keenly contested between Tottenham, Arsenal, West Ham and Man Utd, Arsenal who should have been tip to clinch the spot are very inconsistent in their performances, despite the fact that they are out of every competitions, except they up their game in their remaining EPL matches else they may end up qualifying for Europa league,
Arteta is relying on Lacazette and Nketia as their main striker till the end of the season which is reasonable considering the fact that Arsenal has 17 EPL matches till end of the season.
Arsenal still has the same chance. if Arteta can stabilize Arsenal's game on a winning trend. because there is news in the team, there is a tension that makes the team's game less good.
maybe Arteta should be more selective in choosing players in the main and reserve squads. because actually, Arsenal has good players. they can enter in the top 4 if they finish the remaining games until the end of the season well.
Maybe the tension you mean is between Arteta and Aubameyang?
I think the tension is now over after Aubameyang departure to Barcelona, indeed Arsenal still have a chance to reach the Champions League zone, but I don't think it's an easy thing for them because now they have a fairly limited squad, and it's not an easy thing for Arteta to be able to stabilize arsenal game if only relying on the existing squad as it is today, Seeing the condition of arsenal which lost many players in the transfer market and they did not bring in any players this season, I think arsenal will again fail to return to the champions league next season.