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As for the "banquet", it is a classic One Piece ending that Sakae-chan has said in previous interviews that it is a scene he definitely wants to draw, and it seems that he is fully prepared to draw it in the final chapter as well. It is a "grand banquet".
However, if the "huge battle" is the last episode of the story, it is difficult to imagine that the war will end without any casualties, and that would be too unrealistic.
In order to have a grand finale of the banquet, many people who cooperate with Luffy will participate
, there will be no casualties, and something big will need to be accomplished .
https://onepiece.ria10.com/Entry/4597/
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well oda shown he trying to avoid deaths, so need stronger crew.