User blog comment:Thomasfan502/Season 8 Discussion Blog/@comment-29197449-20171221051554/@comment-31892545-20171221201828

We can also count S4 as “Save the Earth” if we look at it from the viewpoint of bringing harmony among people and later saving the Major Fairies’ respective earthen territories with the Gifts of Destiny, but S5 was really the true beginning of that era.

One school of thinking is the animal theme of S7 would’ve made more sense coming after S4 since Roxy was newly introduced and having her on the team wouldn’t be as jarring as it was, and an animal-themed season wouldn’t have been far off to come next.