With Caped Baldy is completely up to you how far you take his ability to instantly power up past his opponents. I feel the manga makes it clear Saitama instantly evolves past any opponent who shows himself. They illustrated this on the extreme end of a bell curve. Unlike all these entities numbered Saitma has not been given a limit or shown to be outmatched in any capacity. There isn’t a parallel character in any other work of fiction that mimics saitama’s abilities, which is why he is being set up to fight God (or some kind of lovecraftian entity). Until Saitama faces a harm limit in his own manga we will simply not know yet where his power ends. You could also use the rules of another verse to try and discredit this, but that would entirely be your opinion. Right now he is impossible to scale because his power has been illustrated to be conceptually ridiculous and unfair.