User blog comment:Coquidragon/New Anime Filler = Canon/@comment-7418318-20150812233448

This only tells us that at least some of the stuff added in the anime comes from Hiro Mashima, but it doesn't mean that everything is.

And since we know no specifics, we also can't really tell which of the additions are the ones Hiro made and wrote about and which ones are made up by A1.

For example I'm pretty sure that this tank-thing that Makarov destroyed isn't one of the three enemies Hiro meant.