User blog comment:IamJakuhoRaikoben/Chapter 470: The Hybrid Theory, Review./@comment-27674224-20160126181825/@comment-5672982-20160129224338

Aside Zirconis, I would heavily put faith in that guess, yeah.

Purgatory Dragon Slayer Magic - Atlas Flame Sea King Dragon Slayer Magic - Levia Cavern Dragon Slayer Magic - Rock Dragon (Unnamed) Gale Dragon Slayer Magic - Perhaps Scissor Runner?

As for the other four unknown DS types he might have, I would take guess in the following:

Motherglare - Diamond/Adamantine Dragon Slayer Magic? Adamantine often refers to diamonds or some other hard metal/mineral type, and looking further, it might be a enhanced stronger variation of Iron Dragon Slayer Magic

Zirconis - Perhaps Jade Dragon Slayer Magic could be some form of poison or jungle type magic? If its Poison, it would likely reference Cobra's Poison Dragon Slayer Magic.

Aside that, I wouldn't know for the unnamed Dark Dragon, but if I had to make a safe bet, I'd say its a variation on Rogue's Shadow Dragon Slayer magic. Perhaps, if so, its named Dark/Night Dragon Slayer Magic.

As for what the last DS type magic might be....well, even I wouldn't know that for sure.