User blog comment:Jopjopjop/Volume 18 Spoilers/@comment-3325617-20140704231759/@comment-25136646-20140711173005

I agree as well. It is mentioned Dragons are the embodiment of power and they have been worshiped and feared in every mythology. They might all reunite to assist Great Red who seems to be the God of all Dragons.

I think Issei has something to do with this. He has a great compability with Dragons and Ddraig mentioned that Issei is different compared to his previous hosts.