Rodri is definitely a very important player in the Manchester City squad. Manchester City's midfield remains stable with Rodri in the squad. But I think Kevin De Bruyne is the most important player for Manchester City than Rodri. De Bruyne is a fantastic player. He is able to stabilize the midfield, assist and score when the team needs it. And Manchester City will not have this important player with the squad against Arsenal. De Bruyne, Kyle Walker, Akenji and Ederson will not be with the squad for this match.
I don't think De Bruyne's importance at Mancity can be greater than Rodri's. Remember that some time ago, Mancity lacked Kevin for a long time but they still played well if Rodri was still in the squad, but when Mancity was without Rodri, they continuously encountered difficulties with defeats. I do not deny the importance of De Bruyne in Mancity as he is an important link that helps Mancity's attack explode. But without Rodri, both the midfield and defenders will have problems and the hole he leaves behind is huge. Without Kevin in the upcoming match, Mancity will have a lot of difficulty scoring goals, but Arsenal is no better when the two main strikers, Martinelli and Saka are also in pain and not sure can play or not.