Sort of idea? · 5:09pm Feb 6th, 2018
So I've been thinking about it for a while and I've come up with a theory. As far as we know, in canon, there has never been multiple ponies getting their cutie marks at the same exact time. Not counting the Mane 6 (and maybe Starlight and Sunset), or the Princesses (who probably had their cutie marks at birth) there has never been an instance of more than one pony getting their cutie mark at the same time as another pony. Then come the CMCs. Scootaloo, Sweetie Belle and Applebloom. Three ponies. Who all get their cutie mark at the EXACT same time. Top that off with the fact that their cutie marks are BASICALLY the exact same thing. A shield with something to do with what they enjoy on it. Sweetie Belle with a musical note in a star, she likes to sing. Scootaloo with a lightning bolt and a wing, she likes Rainbow Dash, who is a Wonderbolt. Applebloom with an apple and a heart. She loves her family (represented by the heart) and is an apple farmer. ALL three of them have shields. If anyone, besides Hasbro themselves, says "It's just a coincidence", they are lying.
Twilight and the Mane Six all got BASICALLY the same kind of cutie marks. The exception to that is Twilight and Rainbow Dash. Applejack, three apples. Rarity, three gems. Pinkie Pie, three balloons. Fluttershy, three butterflies. Rainbow Dash, a tri-colored lightning bolt coming out of a cloud. Three colors. Twilight Sparkle, a SIX POINTED STAR surrounded by six other stars. A multiple of THREE. Even Starlight Glimmer has a tri-colored cutie-mark. Blue, purple, and teal. Every pony in the Mane Six (plus Starlight), has three colors or three images for their cutie marks. I don't remember what Sunset Shimmer's cutie mark looked like, but I believe the "rule of three" is there too.
Celestia and Luna, we can assume, got their cutie marks at the same time. A single object each. The sun and the moon respectively. Cadance got a heart with gold... wings? I'll call 'em wings. So far, from what I've noticed, every IMPORTANT plot character has multi-faceted or multi-colored cutie marks. Once, such as JUST the Mane Six and CMCs is a coincidence. Twice is a possible accident. EVERY SINGLE CHARACTER that's plot important having multi-colored cutie marks? That goes from Coincidence to on purpose.
That is a very interesting