Pirates are likes Saiyans. The greatest of them DO lose, but, they always come back stronger and never let their hunger for greatness waver.
The entire narrative, with Luffy being destined to be Pirate King just because this is a shounen series, is working against Kid, and he just keeps working and getting stronger anyway. He's a really nice contract to Law's more scheming, low-key personality, seeing Kid fight Giants should be fun (DON'T OFFSCREEN THIS ODA).