A battle of true legends. Anyway, I got Kaido and prime Whitebeard mainly for their insane physical stats. Whitebeard at old age was capable of fighting with HEAVY injuries and even half of his face being burned and was still going strong while Kaido has the durability to tank very powerful attacks from the Worst Gen and Yamato as well. He even had the stamina and endurance to fight a fully healed Luffy (zoan awakenings gives a user fast recovery and better physical stats) and despite being badly injured, he was still giving Luffy a run for his money. On top of all of this, both Kaido and Whitebeard have some insane AP (Kaido being able to damage an awakened Zoan user with a rubbery body) while Whitebeard has can coat his blade with advanced armament and advanced conquerors and more than likely his quake power as well to give off insane damage to the opponent.

Long story short, I think they'll come out last due to being able to fight the longest while also having the haki needed to keep up with the other characters on the list.

Mihawk and Luffy seem pretty outmatched.

Kaido and primebeard