User blog comment:Bcb3/Theory on Orihime and Quincy powers/@comment-11051098-20130704215444

The only thing about your theory that doesn't match, is what was stated by Isshin in Chapter 537:

"To regain his power, Juhabach stole the power from mixed-blood Quincies, whom he considered "impure", and made it his own."

Yhwach stole the power from all Gemischt Quincy, but he did it to regain his own power.

Whether there is something else we don't know to that, concerning the "creation" of Quincy like Azguiaro Ebern who was an Arrancar, isn't clear.