User blog comment:Staw-Hat Luffy/About Kaido/@comment-122.167.91.10-20130204122126

One interpretation of 'not considered to be human' could be that he is so cruel a pirate, he does not have a shred of humanity left in him. Idk why everyone is fixed on the idea that he is a Zoan/cyborg/non human species. This is all speculation so shouldnt we keep all logical avenues open?