User blog:Lemedicus/did togashi copy final zetsuga tensho? with adult form gon?

ok so basically, i have been thinking did togashi copy bleach's final zetsuga tensho, or was it the other way around... my friend keeps thinking that adult form gon copied bleach's ichigo's final zetsuga tensho.. please help what came first?? Cuz both characters ended up losing their powers after using it? Gon loses nen, ichigo loses soul reaper powers. please help thanks