Here is the case in one line: Goku has concrete feats at a scale Saitama cannot match without hand-waving. Ultra Instinct Goku has traded blows with universe-threatening beings, and he brings instant transmission, ki sensing, ranged energy attacks, and real martial skill. The other side has to lean on a gag premise and undefined no-limits hype, not actual showings. Against someone who can erase, outmaneuver, and outfight him, Saitama's blank check runs out. My opponent can call him unbeatable by narrative; I call that an admission, not an argument.