User blog comment:B214/Light Novel Volume 16 spoilers/@comment-1884090-20131122135652/@comment-1884090-20131122180746

After i was writing this something clicked issei has dragon powers from four categories now his Strongest Form is Crimson Queen which is promotion to queen combined with his boosted gear scale mail then he awakens his new divine dividing powers plus his new body made from great red flesh through ophis powers so i think he will learn/awaken new dragon abilities he has powers from the 4 strongest dragons my thought is it would kind of all combine into something new im still not sure though as for yuuto i was kinda hoping that that he would either find a way to uncurse the demon swords and or have them combine like Ex Durandal but an ultimate holy demonic sword sounds pretty freakin awesome and Akeno i think she will master her new move but i also think she will gain more wings as time goes on and as for asia i completly agree with you and the thing i like about Rossweisse is i have no idea or any opinion about how she will get more powerfull in this case i like it being a suprise some mystery is always nice and i love how rias is starting to become more powerfull