User blog comment:FinalFlash18/Random HxH Questions/@comment-14902757-20140704032029/@comment-14902757-20140704160647

I don't read the manga so I could be wrong but since Netero himself selected the Zodiacs (according to the description) then there shouldn't be any problem for him to ask for their help in times of great need (he knew right off the bat that he might have to sacrifice himself to accomplish the job) aside from their availability.