User blog comment:Marco the Marine Admiral/Orga is not a God Slayer/@comment-184.76.195.229-20121025093003

I'd say there's a good likelihood that Hiro Mashima could have just not used the prefix "God-Slayer" for the attacks so far in order to preserve the 'surprise' for when Orga finally reveals whether he's really a God-Slayer or not.

Right now, the story is written so that readers can assume he is based on previous God-Slayer characters, but it can also just be set up for a twist revealing he's not or he's something different.