User blog comment:Jopjopjop/Volume 18 Spoilers/@comment-3325617-20140704231759/@comment-24502975-20140704235909

Now that you mention it... that would be pretty cool and would make sense. He's supposed to wake up when it's the end of the world, and that's pretty damn close.

Ophis mentioned the gathering of the Dragon-Kings, maybe for the final battle against 666 all the Dragon Kings will gather together with the Two-Heavenly Dragons, the Infinite Dragon God and the True-Dragon.