Kaido’s character design and Devil Fruit are just nothing, they tells us nothing about his world views and overall character, mainly because Kaido doesn’t have consistent world views or a consistent character and contradicts himself every other panel lol.
Kaido's and the Beasts Pirates concepts overall are just a big amount of wasted potential, though. It would have been very easy to think of something richer than this; mainly because Oda himself had the material in front of his eyes but never made full use of it. Of course we need to see Kaido's past and so on, but he's a character incredibly easy to write and I feel like Oda just failed so far and will keep failing with him.