Wow. Haha! I loved the chapter. One must of had a lot of fun writing it. We got all the ideology coming to a head in the webcomic so didn’t need it in the manga. It’s even cooler that he initially wrote it to come to Garou/Saitama sitting down, but changed his mind. Why not? Why write if you’re not gonna have fun?
As for the feats and stuff, I don’t think the stars were obliterated anymore. My sense is just that the large “gap” is the size of the explosion relative to how people would see it on Earth. Kind of like you’d see the moon, but in this cause it the brightness of the clash that bloated out the view of the stars. - The feat before that was Garou’s Gamma ray burst, which evidently didn’t have the power to star just, since Garou seeing Jupiter sneezed away wouldn’t shock him so much if he could star bust…
Dunno. I’m curious if Saitama actually keep the skills in learned in the no longer existing future. His growth can’t decrease, but he’d be clueless how to use the skill.