You see, tough guys like Shirohige put up a good fight, but they're no match for a guy like Shanks. Shanks has a power level of 80 which is unbeatable. Although Shirohige has a devil fruit called gura gura no-mi that can cause earthquakes, Shanks' advanced kenbunshoku haki allows him to sense every move of his opponent and dodge it like a boss. Plus, his unbeatable sword skills with a great saber called Gryphon, makes him dangerous as hell. Shanks' kamusari can create powerful slash attack that cut through anything including Shirohige's massive tomoe type naginata murakumogiri. Even if Shirohige utilizes his ability to create a tsunami by earthquake, Shanks' advanced busoshoku haki allows him to harden his body to withstand any damage and attack Shirohige fiercely. In short, Shanks is the real deal.