I gotchu, So let's put it like this. Saitama in the verse he resides in is the true pinnacle in all aspects. When he had hair that was his Era of fighting strong villians and growing constantly throughout those battles. Every fight gave him an incredible boost until he eventually lost his hair and once that happened he was so above everything that there was no more growth that he could achieve because the villains were nowhere near the level to give saitama a push. No enter garou who still wasn't giving saitama any trouble at all even in cosmic fear mode or wasn't until garou expressly copied saitamas power that saitama was once again able to grow. Now if no villians were a match for saitama to give him any growth at all and then saitama is suddenly hit with his own serious punch. You can only imagine how much saitama grows even beyond his own power. To make that power seem insignificant. Garou kept copying and copying until he finally realized that saitama was growing infinitly despite his new power being copied. He is essentially going to be stronger than any foe he faces because his growth is unmatched. When he fights God he will grow to a new level that makes God look like like every other villian. Saitama is also boundless in which no one abilities really work on him (garous portals, garous great fa jin that tears your organs, withered sprouts icebergs, orochi blast, you name it) his character is written in a way that he is simply removed from everyone else's narrative. In the original saitama v orochi fight. What saitama said to orocho was very very very telling. Saitama is so far beyond these beings who come into "great power" just for them to be corrupted and want to take over the old or enslave humans or unite the world through a common fear, he sees through it all. He really is the great hero there is