What is your opinion? Comment below *Spoilers in the Notes and Credits!!* Sorry that it's so lengthy in words Images from google, press space bar
Personally, I don't think the idea is valid. I know the whole idea comes from what Yoshihiro Togashi did in the manga, which was put the family photo (as seen in the project) and a picture of Feitan. I seriously believe that the person that turned is Alluka, (<3) But even so, I want to know what you think. If Feitan was a Zoldyck, he'd have to be a half brother, because the only way he could've come into the family would be through Kiyoko, who lived in Meteor City, which is where Feitan comes from. He also has Kiyoko's hair colour, as well as all the siblings (minus Killua) After marrying Silva, she'd have likely abandoned Feitan. Also, some people think that when Kalluto joined the phantom troupe (#4) and said that he wanted to bring his brother home, he was referring to Feitan. But neither showed ANY recognition, and I honestly think that he was referring to Killua.