User blog comment:MarineroLelouch/Power Ranking and Classes./@comment-92.96.32.189-20140215151525/@comment-24467372-20140215164215

I'm assuming Mashima just used the same Dragon to represent something. And also there is the fact that Gajeel and Natsu are older than 80 years old. The whole Resha/Elie thing he used in Rave Master seems to be recycled where characters who look young turn out to be coming from the past.

But still this doesn't mean he's a king. As far as we know all the other dragons existed 400 years ago,alongside Zirconis,Atlas Flame and etc..Not every Dragon who gave DS powers to someone is a king.