User blog comment:B214/Talk About What You Want! 2/@comment-4547267-20140720054308/@comment-24098614-20140720061335

Kuroka might be a free spirit but there is no such thing as saying that she can't be recruited for a Peerage member because she has two bishop pieces inside of her because there are ways to get around that particular rule.

You have to remember in Dxd the word impossible doesn't exist because there are a lot of things like for instance Issei surviving his death, and receiving the flesh of Great Red ,and Ophis  stabilizing his soul with her powers that feat in itself should be impossible as well so Kuroka not being able to be recruited is a synch compared to what happened to Issei.

The word impossible shouldn't be used around Issei and this story itself because the unthinkable happens when you least expect it.