I feel like blackbeard would win because he would probably have some dirty tricks. But if blackbeard doesn't have any tricks I think kaido or whitebeard can win this.

Ooh, if Whitebeard was Healthy, I could see him doing some Old Garp level shenanigans. The two should be equal, especially since Whitebeard's health being good should let him used Advanced Haoshoku. I honestly like Whitebeard in this fight. Especially since, with Base Buso, his Devil Fruit, and bad health he fought on par with Akainu (I said on par, I ain't trying to pull some controversy by saying one side would beat the other.) With Advanced Haoshoku, I like the odds.