User blog comment:Martialmaniac/Zzigg Zoldyck's fate?/@comment-4896558-20141103063251/@comment-5780397-20141103114416

They are listed from the most to the least plausible, at least in my view. Atually, we are not even sure that guy is actually Zzigg, since he looks so different (although on the wiki it is written he is), but it might just be that Togashi forgot he had already sketched him in the past. Personally, the new design is my favorite.