This is why I am sure Saka returning won't matter much. They didn't do terrible without Saka, so they saw that they do not need him all that much, sure it's cool to have him, but not like they were losing games all the time when he was out.
Plus, Liverpool is doing awesome right now, and Salah is doing amazing as well, so that means as long as Liverpool keeps doing this great, we are not going to see Arsenal win, no matter who they have. Arsenals fate is not based on what Arsenal does, they can win all the games, their fate depends on Liverpool and how they do, if they do well then we are not going to see Arsenal catch up. This is why no matter if Saka returns or not, we are not going to end up seeing Arsenal win, as long as Liverpool stays great.
I think before Saka left for the injury treatment, Arsenal was below the top 4 on the table, it was the combine effort of the team that brought them back and that happened when Saka isn't around. The team can do without him but with his present, tbe functionality of the team is going to improve unless the rest of the players are not going to put effort like they used to feel when the guy wasn't really around, you know someone present can make some people not feell comfortable.
Regardless, Arsenal is going to do well but they can't get to where Liverpool is right now unless that Liverpool fumble and refused to win matches because the way I'm seeing Liverpool at the top of the table and been one of the top that made it to know out in the Champions League, there is nothing Arsenal can do on earth to unsit Liverpool unless they refused to win matches they have now till the end of the season but I doubt if they can risk it.