User blog comment:B214/Volume 23 discussion blog/@comment-31137559-20170423170210/@comment-79.25.167.4-20170424002859

I think that Ishibumi could have left that opening exactly for this purpose. Why he would have ever written that the second Knight Sona wanted was not Bennia but someone else and that she was a replacement? I don't get the reason why he would have said so. If Sona is able to contact the one she wanted, she could trade Bennia with Issei. I'm not saying that she will go to Bennia saying "I found the one I wanted, screw you", but if Bennia keeps talking about Issei maybe Sona could offer her the possibility to join his peerage and after that she could find the candidate she wanted, so everyone would be happy.

By the way, I would absolutely prefer a new character to be Issei's second Knight, but the fact that Bennia wasn't the Knight Sona had in mind at the beginning is very suspect to not think about this possibility.