Hmm... Predict the unpredictable? Alright, I got it; the next crewmate will be:
SpoilerCaribou! See, he fills the gap of the token Belkar of the crew, and Luffy will eventually convert him into joining for real just like Whitebeard got Ace to join his crew. Plus, he's a Logia, so he, by default, has unique skills to lend to the crew.
The time the Lucci dodged Luffy's gatling attack, he was using Kami-e, which functioned similarly to Luffy's Gum Gum idiot. It doesn't grant them any precognitive abilities, just the ability to roll with the punches.
The main reason I suggested Haki for Zoro there though was because of how similar Zoro's "Breath of all things" sounds to Gol D. Roger's "Voice of all things". Of course, they are probably all completely unrelated, and I'm just coming up with random insane theories.
SpoilerNah, don't see it happen. I almost got a Heel Face Turn vibe from Hody if only because of his anger against Decken to go up and save the island... both of them teaming up again... dunno.
SpoilerHody may be angry at Decken for being crazy, but I don't think that he'd turn down an opportunity to double team against Luffy, especially not in an environment that benefits him most. But, this is Hody, and he just might be arrogant enough to think that he could take Luffy alone as long as he's underwater.