User blog comment:Miskos3/Fairy Tail Episode 258: Tartaros arc: The Fire Dragon's Iron Fist, Review/@comment-24039234-20151107122842/@comment-5840892-20151110052929

I liked KotSS....

And I still count it as cannon, it get referenced in the manga, and I have heard rumors Hiro wrote the arc himself and intended it for the manga but handed it over to the anime team to use for filler so he could get ahead...

And after seeing that clusterfuck of a disapoint that was the Eclipse Spirit arc.....I'm more convinced than ever Hiro wrote KotSS for some reason.