That’s not a world ending creature. If that’s the case Deku used 1,000,000% in the first muscular fight. I can say Luffy is massively faster than light immediately after the time skip based on how he dodge the Pacifista lasers that are from Kizaru. Then that’s prior to G4 or G5 which increase his speed even more therefore Asta would be slow to compete. I could give you a ton of reasons why Asta can’t win. But the main one is that Luffy doesn’t use magic. Asta has to get help against people who use magic and he has anti magic. How can he beat someone he can’t nerf. Asta best trait outside of anti magic is his speed and strength Luffy is faster and stronger. Then Asta has Zetten which won’t matter when he’s turned into rubber.