User blog:Young quincy/itchigo= quincy/shinigami?

i am new here so forgive if i spell something wrong or am mis informed, but ok itchigo's dad's zanpacto is named engetsu his is zangetsu they both use getsuga tensho, and zangetsu said in the anime when itchigo regained his power after rukia got taken that itchigo was already a soul reaper, now his dad said he's not so i am confused to how that is posible even if isshin lost his powers using the final getsuga tensho his powers would return like itchigo's even though the others gave him a portion of their power. so how is he not if he is isshins son?