Don't you know the fact that if Arsenal is always tie to the Saka? Once he missed the game, then Arsenal is nothing than a bunch of guys who being so clueless. Arsenal is absolutely terrible without him, not many big chances created, unable to break the line, and many more.
I think it's has been mentioned so many times about how Arsenal's attack always flanking from Saka's side. If you're regularly watching PL, you must know this cuz it's a basic thing about Arsenal.
Arsenal is Saka FC.
Yes, Saka is a key player, the same as Rodri, who makes Manchester City be like this when he can not turn on the field. Arteta is a former Guardiola assistant and will apply the same thing with his mentor, Pep. These kinds of coaches will rely on one person to control the game, organize the attack patterns and rhythm of the match, so if a player is injured or has a problem, it makes the club lame, they are like a ship without a captain, they will find it difficult to win the match. Arsenal will continue like this until Saka comes back to play. But if Arsenal has a player who can play as role at the beginning, it probably won't be like this, Arteta must prepare a player who is qualified or the same skill as Saka.