Not really, no.
And why isn't power scaling suddenly not allowed?
Frankenstein has beaten Superman, as per your quote. He did it without weakness exploitation. So he MUST be stronger, or faster, or more durable.... Otherwise, you're literally arguing that a weaker character beats a stronger character without context.
Unless of course, Superman/Flash/WW weren't going all out?
In THAT case, you cannot honestly say Frankenstein/Cheetah etc are on their level, or greater than them 🙂
Can't have it both ways. Either they're better than the heroes I named (which gives me their feats) or they're not, in which case you're putting Saitama up against slow/weak meta's 😂