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Is not willpower. He had no food to eat. Zoro chose to not eat, he actually eat that same day. Zoro speech was bullshit that time, he just stayed 3 days without food. He thought he would handle a month but he didn't even stayed a week and spit bullshit about Luffy willpower. Probably Luffy would never accept that "challenge" but Luffy wouldn't be stupid enough to believe that blonde guy son of marine captain I forgot the name. So we can really say someone has better willpower for being starving. I could say Zoro at that time already had better endurance than WCI Luffy though hahahahaha. At least when talking about starvation.
Sanji 2 months without food is incredible(maybe Zeff have left some of his leg and gave to him?) but is not related to willpower at all.
Sanji 2 months without food is incredible(maybe Zeff have left some of his leg and gave to him?) but is not related to willpower at all.