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.
And in a recent match, Guardiola did not allow De Bruyne to finish the match, if I’m not mistaken it was in the match with Liverpool, so this shows how Guardiola evaluates each player individually, and his value in each individual game.
Of course, De Bruyne is a very talented player, and he is very important for City, but Guardiola will never build a game around one player, if someone is injured there is a replacement for him. When Haaland was injured, Foden was excellent as a goalscorer, and Haaland's absence was not noticeable. City is a very strong team and every player there deserves his place in the team.