User blog comment:Phoenixs23/Kaido of the 100 Beast Theory/@comment-972068-20130125200534

Your first theory:

1) Sounds interesting. If it were true, he'd likely use Chopper to fight against the Straw Hats when they confront each other. However, the fruit all-in-all sounds slightly contradictory, as humans are animals too. Even if humans are excluded from this, would he even be able to control Chopper?

2) Once again, doubtful because of humans being animals. Also, Bentham used his fruit on Chopper twice and it worked. So I don't think a downgrade Devil Fruit like that really exists.

Your second theory:

1) Seems like quite a lot of Devil Fruits to be very plausible.

2) See above.

Overall, my personal theory is that Kaido ahs no Devil Fruit or Haki. He's just one tough mudda-fukka.