But isn't there a a pretty big problem in that, logic wise speaking; It is not permament. Aka; if the Quincy wait till it's effect wears off they could still steal it. (Yes it's too much overthinking, but still :P)
After a quick reread it seems more that they absorb, and permamently have a "small" hollowfication in them. Better said; their body, their reiatsu, their blood cells, hell, their tiny toe has it if you want, they have a tiny bit of Hollow in them. Permamently. Not enough to go Hollow or Ressureccion. But JUST enough to be deadly to Quincy.
Will the Bankai itself do extra damage too now that it has been "poisoned" or shall it remain the same?