Among this two leagues you made mention of the possibility of arsenal to top EPL is very slim because if you look at the EPL table you will notice the point difference between Liverpool and arsenal is some how high and Liverpool on the other after losing to Plymouth at the FA cup will put all there efforts in making sure that they win the premier league title.
Saka returns may not really make much of a difference because the match between mancity and arsenal is an evidence the club did very well even without him playing. So there prayer should be for Liverpool to lose to Everton so that they can close up in points with them, if not I doubt if this season and the previous will Make any difference for arsenal.
It will certainly be much more difficult for Arsenal to catch up on Liverpool's points even though Saka will return to strengthen the team after recovering from his injury. Now the gap is six points from Liverpool and there is still one game left to be played so that the difference in points between the two will be even further. Facing Everton in week 24, it is very unlikely that Liverpool will lose because so far Everton's performance has been much worse and there may be no change in the standings this week because of the much easier match for Liverpool.