User blog comment:DeathGodPrayer/Talk About What You Want!/@comment-82.178.91.153-20140209043700/@comment-1359322-20140209051236

Who knows Venelana only appeared in Volume 5 & 10 and both moments can be easily be taken over by Grayfia. Grayfia is quite similar with Venelana after all.

For Volume 5, they could do like Grayfia trains Issei under Venelana's orders. Then for Volume 10, they could also do it like Grayfia took a day off to accompany Millicas to the Oppai Dragon event too, and like in Volume 8, Grayfia could lecture Rias in a same way as Venelana.