Re reading the Saitama vs Cosmic Garou fight had me realize this was actually SAITAMA vs SAITAMA. Garou was an irrelevant shell.
Man, Cosmic Fear Garou is a MENACE. He can in fact kill everyone in the series at that point even without Mode:Saitama.
But Saitama is just... on another level entirely.
I just realized the second half of the fight Garou was in PERMANENT Mode:Saitama form.
If he had he gone normal Cosmic Fear mode for a split second, a mere punch would have splattered him to pieces due to Saitama's growth.
The fight was literally SAITAMA vs SAITAMA. Cosmic fear Garou was irrelevant. The only saving grace he had was Mode:Saitama.
He'd get the Empty Void treatment as well without copying Caped Baldy. Crazy.