We're almost 90 chapters into the arc of Wano, do we really not even need, but want the set ups, action, etc. to go back to square one? I insist: will people even enjoy another, what, 30 additional chapters about the alliance losing, then escaping, then reorganizing, then coming back for revenge, then establishing the versus, etc.? I personally don't, and I don't recall any arc in which everybody was defeated and had a round two. As far as I understand it, the alliance will defeat the Beasts Pirates except for Kaido, who will fly to the mainland in order to destroy it in revenge and that's where he will fall in the hands of Luffy.