User blog comment:IamJakuhoRaikoben/Chapter 337: The Golden Plains, Review./@comment-4938779-20130628140355/@comment-7418318-20130628144957

Though it does open a few new questions about those Dragon Slayers from 400 years ago (yay, more speculation material :D ).

Where the past Dragon Slayer trained for a longer period? Where they only able to overpower Dragons by outnumbering them? Did they have to work together with their Dragon allies at first and only later gained the strength to go one-on-one with Dragons?

Did they plan to kill all Dragons from the start and only pretended to be allies because of that last point?