Luffy stating again that he will beat Kaido, and again you see some who still thinks Zoro will kill Kaido. don't see how they think will Oda do it? he let Luffy say 100 times that he will defeat Kaido and then let Zoro do the actual work.
either Luffy doesn't defeat Kaido entirely and then Zoro comes and defeat him for good, that would make Zoro have the best part of the battle beside defeating his own opponent. that is ridiculous.
or Luffy defeats Kaido entirely and then Zoro comes and kill defeated and unconscious Kaido, which would a dishonorable act, that goes against Zoro's principles, which is more ridiculous.