User blog comment:IamJakuhoRaikoben/Chapter 462: Battlefield, Review./@comment-1839664-20151116155316/@comment-2125188-20151116165049

Before we got the chapters for Mavis' flashback in the manga, I always thought FT Zero would be animated at the end of Tartaros. Cause once Mavis finds out Fairy Tail is disbanding, it would make sense for her to think back to when the guild was first created.

I also think a similar thing could happen with Ice Trail, where Gray remembers his journey on how he joins the guild.

It's probably not the best place to put FT Zero, but still a good spot imo