User blog comment:Silva92/Killua's Nen/@comment-15819531-20130907100555

Maybe Silva didn't teach nen to Killua, because Killua was too rebelling against his family.

Can't person only join the Spiders, if he/she can use nen and defeat their enemies? I don't think they'll take people who can't use nen in they group and then teach the person about nen. And it was stated Kalluto learned nen earlier than Killua and Gon. Probably Kalluto was teached nen earlier because he's more obedient than Killua or maybe he teached himself, so he could join Spiders. And Kalluto joined after the events of Yorknew City arc. Kalluto's zetsu is perfect and i can't imagine perfecting zetsu so quickly. And Kalluto even has some special ability to track people. It would be too short time him to learn so much about nen.

Sorry for any mistakes :3