Regarding Kaku and Lucci. Your argument with the other guy was that Zoro never lost to Kuma since Kuma never bested him in battle.
Read this chapter and tell me if Kaku "never bested" Zorro.
https://ww8.readonepiece.com/chapter/one-piece-chapter-348/
As per your Enel argument, you argue against Devil Fruit since Zoro can't cut him. That is not the point. Was he "Bested" by Enel? Yes or No?
Now you might argue Zoro had no CoA yet. We're not arguing about possibilities. We are arguing about results. If Luffy had CoA when he initially fought Crocodile had he won? Good chance he would've have. In the story, did he lose that first round? Yes. In. Story.
