User blog comment:Marco the Marine Admiral/Orga is not a God Slayer/@comment-1534821-20121024102351

But when Laxus switch to his "dragon slayer mode" he uses Lightning Dragon's Magic instead of Lightning Magic (his spell are "Lightning Dragon's Roar, Lightning Dragon's Heavenward Halberd, ecc), while Orga uses his black lightning constantly. So I think that probably he is a normal God Slayer.