User blog comment:S.C. Amigo/Theory on the 4th Yonkou./@comment-53539-20100409080109

''all 4 yonkou are men,the one with the curly hair is kaidou,the other with the hat and the mustache is the unknown yonku. ''

No, we've not been told which is which anon. Some folks also claim the other one is Kaidou.