User blog comment:Zoroter12/What if.../@comment-1771627-20150110204810

I don't know, my theory about the "quincies destroy hollows" thing is that when a shinigami kills a hollow, its soul moves on within the natural cycle of things, but when a part of Yhwach (all quincies have a fragment of Yhwach within themselves) is involved it sucks on the hollow's soul for the original King of Quincies to feed on. That's how he has gained strength throughout this almost thousand years, regaining his life, etc etc. It's not that things killed by quincies vanish from existence, they are simply redirected to Yhwach. But your idea is good as well, just for the sake of BRAINSTOOOORMM!