User blog comment:Xilinoc/Ch. 586 - The Headless Star 5/@comment-11506376-20140625171259/@comment-24306779-20140626182653

In my logic, the fact itslef that he survived -even if just barely - was enough for Yhwach to acknoweledge his strength and recruit him in the Sternritter. That's just speculation, but the fact itself that he took Uryu in, who is a Mischlung Quincy - though a special one with an unrivaled potential, sure - supports this hypotesis. I repeat, that's just a possible interpretation of facts. The key aspect of this thinking is that Yhwach calls As a "Survivor".