>>281737825 (OP)
The manga is literally OPM 2.0 and superior in every way.
It never made sense for Saitama to say anything deep, he was literally created as the idea of a superficial hero who beat any monster, making a joke of tight battle, of deep character development, of constant powerlevel increase. Creating a contrast for characters who actually go into the details.
The Saitama vs Garou was far better than the manga, even ignoring the arts.
Garou needed to cross the line then regret it, he needed to reach absolute bullshit powerlevel and see he still wouldn't match Saitama, because of the very powercreep the manga was created to mock.
And there's no better way for Garou to understand what he truly wanted to be than to give up everything he became to save it.
I would still fix a few things if I could but that's mostly details.