Yes I’m power scaling, fuck you.
If Viltrumites (from invincible) invaded the OPM universe, how much effort would Saitama have to put in to defeat them? Each and every one of them basically scales the entire universe, so I can’t imagine he’ll be able to one shot all of them, but would they give him the fight he’s looking for?
OPM’s central premise is that he is at the top of the power scaling. Yes he can beat goku, yes he can beat superman, yes he can beat omniman. Thats his whole conceit