Board Thread:Questions and Answers/@comment-23856040-20130928160348/@comment-26420452-20130929131757

The most of important to note is that Masaki didn't die directly of the Auswählen like the Gemischt Quincies. She got involved in a battle without knowing her powers (in particular Blut Vene) were gone and got fatally injured. Her children survived because probably their powers were dormant. I hypothesise that Uryū survived because the Ishida bloodline was so pure that even having a child with a Gemischt Quincy could give an extremely powerful individual. All of this is said considering that Auswählen happened spontaneously (as it has been served until now to us). I strongly doubt that in fact, it was a hand-picking according to the whims of the one responsible of his resurrection (probably Haschwalth). We'll have to wait and see.