User blog comment:Xilinoc/Ch. 638 - Boiling Malice and Total Comedy/@comment-10630156-20150806095642/@comment-1338810-20150807024129

Also the whole thing about the Arrancar being able to learn the Quincy technique of creating Heilig Bogen. I think with the proper training/technology, Quincy skills can be replicated by any spiritually active race with sufficient understanding of reishi physics, rather than all these non-Quincy being secretly part Quincy all along. If nothing else, Kubo would never devalue Ichigo's half Quincy heritage by diluting the field with a bunch of other semi-Quincies.