User blog comment:Kaido King of the Beasts/Chapter 802: The Elephant in the Room/@comment-4493594-20151001133320/@comment-111.119.39.246-20151001144917

devil fruit power transfer to the nearest fruit present when it's user dies. It could have originated from zo, but spread out all over the world along with it's user. Just as Bambina's balls were "PAIR", zo's balls could very well be zoan type devil fruit. xD