Ummmm luffys largest attack was against dragon form kaido, which fans estimate to be at LEAST 2.4 miles long, plus along with haki, which could cause a blast so many miles in diameter
Goku has a shadow, gecko moria can take and control people's shadows, and without a shadow, the person dies in the sunlight, luffy beat moria so yeah, but oda himself says luffy will never be able to beat goku so idk mane 🤷♂️
Again the shadow thing, but if its just luffy in his own universe and without Rick going through different dimensions and universes with crazy ass weapons, luffy can go gear 2, increasing his speed making him so fast that the average person cant see him so