User blog comment:Silver-Haired Seireitou/Bleach Fanon Canon/@comment-3030647-20141109085009/@comment-1493741-20141109114725

For the Uryu bit: While the reasoning behind his initial survival hasn't been explained canonically yet, I imagine the idea is that it was a one time thing, or without drinking Yhwach's blood, Auswahlen is less potent so Uryu was somehow able to resist but can't now.