I was thinking how before Twilight became a Princess, there were, in the Mane 6: 2 unicorns, 2 pegasi, and two earth ponies. Just saying, I would be fine if Starlight became part of the Mane 6 (Mane 7?). Then it would be: 1 alicorn, 2 unicorns, 2 pegasi, and 2 earth ponies.