Luffy cannot top that stuff right now. I've always wonder how Luffy will square up to some of these other crazy abilities but he always one ups them. I saw crocky's giant dust devil and was like woah. Luffy can only launch gatling punches, how can he beat an ability like that? Someone he cannot even hit? And bam be defeats Crocodile. And now even Zoro can do a tornado slash. Enel is another great example. That guy launches lightning. In a regular world he'd own everyone with 1 shock. In a non regular world like One Piece's he fights a rubberman after showing us his dazzling lightshows and then subsequebtly get owned by a giant piece of gold to the face. The point is, Luffy cannot spam giant magmaballs or meteors from the sky. He cannot create clones like Doflamingo or Cracker. He couldn't do a lot of things due to the limits of his abilities. The good part about this is that his fighting style allows him to circumvent crazy powers. Now that he has Haki and future sight CoO, spears of ice from Aokiji won't mean shit because he can just dodge it all, move super fast and sock iceman in the face and repeat.
Although that being said, I still do not think Luffy can solo Kaido at the end of this arc. I stand by a team effort. In the end Luffy will deal the final blow after Kaido gains the final upper hand. The point, is even through a team effort (seems like a lot of fights are actually team efforts), the team will probably struggle against Kaidou but in the end Luffy will find a way to KO him. Luffy always find a way because it is shounen. Law cannot defeat Doffy because even with a grand scheme, he cannot find a way and he never would have. His way was Luffy but of course he didn't know that in the beginning, he even remarked how Luffy still had his ace (gear 4th) when Luffy started pummelling Doflamingo because he did not think his alliance would prevail and it'd all fall to shambles. That's why he put his hands over his face to cry and said Damnit when Doffy was about to smash his face in.
