Luccis below Kizaru for sure (he got thrashed by G5), but I legit think its just Kizaru's speed that separates them. Luffy's punches could contest Kaido's Kanbo attacks in base form once he got a grip on Kings/A. Armament haki. In G5 Luffy is kind of an unstoppable monster, and it took everything in Kizaru just to wait him out with minimal damage to Luffy.