User blog comment:B214/Volume 22 spoilers/@comment-121.54.44.91-20170118173807/@comment-31137559-20170206231143

They are not talking about dragons in general, but Issei and Vali. It is quite known that Issei draws beings of power to him. Now it is because of his dragon aura but Issei is doing it at a ridiculous level where even Cao Cao was wondering what he was. They are basically talking about how the events that have happened center around Issei and Vali(Issei specifically though) and how they are literally turning the supernatural world upside down.