User blog comment:Kaido King of the Beasts/Chapter 846: Let's Make a Deal/@comment-24442815-20161117143211

Keep in mind that Luffy was running on crackers in his reserves as opposed to his usual meat. Also, Brook kind of confirmed that the Straw Hats won't be returning to Whole Cake Island after this because even if the whole crew was assembled there would be no way for them to get to the road poneglyph so this is their only chance.