I'm glad at the end of the episode we get to see the kind side of Limestone Pie after AJ apologized to the Pies and Limestone and the other pies forgave the Apples and at the end of the episode we see Limestone happy and sharing some bread rolls with Applebloom and the others that was nice
Limestone is the most sour one of her sisters. That cutie mark fits her character perfectly. She's my least favorite Pie. Pinkie Pie is the best, Maud is 2nd, Marble is 3rd, and she is 100% last.