Board Thread:Questions and Answers/@comment-27836345-20160221055228/@comment-27392440-20160501122208

They also never mentioned that Chad's mother was attacked by a hollow yet he had one, despite it looking less like a fullbring than Orihime's. It's entirely possible that neither had mothers who were attacked by hollows and that their fullbring was manifested by the hogyoku as a way to grant their desires, which would also explain the differences from the other fullbringers such as lack of bringer light.