Talk:The Cart Before the Ponies/@comment-818549-20160731235708/@comment-4531340-20160802022142

I would guess she's still busy working on the movie - I mean, Fluttershy's brother appearing was discussed before the second half of season 5 had even debuted, so it could have been thought of back then. Plus, Larson was credited for story in Rarity Investigates!, even though, as he put it, he had just written an episode that never got produced, but that original script was changed up and morphed into the final product. He had actually stopped working on the show (for the time being) with Amending Fences, IIRC.