The Crawler is a strong fighter whose quirk kept on getting better and better as the story went on. It got to the point where he is now one of the strongest in the verse which is pretty much unheard of for a spinoff character. It’s really quite impressive but ultimately he’s still not beating Gohan. Gohan is the guy who really put the “New Generation” fighters on the map by always keeping up with the main characters. One hit would still be enough to win this fight. Gohan wins.