kitsu told me that aizen created the espada& that they were never human heres my theory

espada&arrancar are hollows who were able to get they're masks off to gain soul reaper powers, which were at onetime regular hollows who did not have that ability, which were at onetime souls who had regrets and lost there center after chain of fate was severed and became a hollow , which were once humans who died

do you like my theory?