Two Pies in trouble

Many will wonder what is missing from Season 4 of MLP: FiM? I, in my humble opinion, the appearance of Marble and Limestone Pie. Sound a little strange, but they had confirmed that Pinkie's sisters appear in season 4; however, appeared a sister named Maud Pie, which made ​​no appearance in another season, even in season 1. despite the confirmation of the news of the return of the sisters of Pinkie, but I was involved Maud, and two sisters (Marble and Limestone) were not taken into account. Like Pinkie and Maud, Marble and Limestone also should have been involved in this season.

Original bases by Beavernator, Bronyboy and FinePrint-MLP