User blog comment:Black Leg Sanji/The Emperor of Chaos Kaido/@comment-1595565-20110521224901/@comment-1595565-20110522025344

Because that one guy X Drake challenged to a fight was a cyborg. So they assume that Kaido is going to be one too. That's like assuming Luffy is a cyborg because Franky is in his crew. People jump to conclusions too quickly. They don't allow any time for things to actually develop.