User blog comment:Xilinoc/Ch. 565 (Mangapanda is run by lazy barnacles)/@comment-9050606-20140123013259/@comment-2211792-20140126064247

Guess BG9's K will be revealed by Yhwach. How shameful, BG9 was one of the most intriguing Quincy characters.

And honestly. If K was really "the Knowledge", it would've made a lot more sense to let BG9 live a little longer and gather more information for Yhwach to absorb later.