It really depends on how long Kusakabe would be able to maintain his simple domain and on what scale, and we have no way to gauge it.
At least we know that Dagon would have to put some % into Kusakabe
during the initial fight Dagon was using 70% on Naobito and 30% on Nanami (and 0% on Maki lol)
Here with a player like Kuz he will have to lower his number on Naobito a lot. So Naobito will last a lot longer. Maybe Dagon wouldn’t be able to punch him. Especially with Kuz around.
‘and knowing how Dagon works he will maybe try to engage Kusakabe in CQC to make him stop his SD and he will get hurt.
And there is a solid chance Dagon doesn’t even get the opportunity to open his domain here. The good guys can maybe kill him and harass him enough for him to be unable to open domain