I compared the Cutie Mark Crusaders to the Forever People.
This, dear readers, is a transcendent moment of nerdity. For one brief, shining moment, I achieved Nerdvana.
Ah, but I can tell by your expressions that this bon mot was sufficiently inbred as to be incomprehensible to any but my fellow Nerdisattvas.
As I have noted in the past, there is a tendency for fans of Jack Kirby's Fourth World Saga to neglect the Forever People, a series about a band of youthful, colorfully-garbed "gods" of New Genesis who can only be described as "Space Hippies". While the Fourth World as a whole is a product of its time, it's the Forever People who are the most dated. They're earnest. They're optimistic. They're corny. "Serious" readers find them embarrassing, and prefer to ignore them or sweep them under the rug, preferring even Kirby's work on Superman's Pal, Jimmy Olsen to this gaudy gang of star-born striplings. Alas, some of those "serious" readers include comic professionals who attempted to continue the King's Magnum Opus.
This is unfortunate, because it is in the pages of the Forever People that Jack clearly spells out, over and over, the key concept of the epic, the Anti-Life Equation -- a MacGuffin that those "serious" readers insist that the King "never really explained". Those embarrassing space hippies are the ones who most often directly confront the Big Bad of the Fourth World, Darkseid, and encounter not one but two individuals who actually wield the Equation itself.
By the same token, there is a tendency amongst Bronies (the Periphery Demographic that helped to catapult My Little Pony: Friendship is Magic from a thirty-minute toy commercial to a global phenomenon) to dismiss, ignore, or just roll their eyes at the episodes centering around a group of secondary characters dubbed "The Cutie Mark Crusaders". The Crusaders are younger than the main cast (a.k.a. the "Mane Six"), being portrayed as schoolchildren. Originally, they were planned as a spin-off aimed at an even younger audience, and, well ... they're earnest. They're optimistic. They're corny.1
It is also in the Crusader-centric episodes that writing staff clearly spells out the key concept of the "Cutie Mark", the mystic brand that adorns the hindquarters of each adult pony. A Cutie Mark appears when a pony finds her True Calling, the vocation or avocation that that will bring her the most fulfillment in life. The Crusaders, last in their age group to achieve this milestone, are determined to do everything they can to hurry the process along.
The puberty metaphors are not accidental, but are, ultimately, incidental. The Cutie Mark is more than just a metaphor; the magic of Equestria may not be rigorous enough to satisfy Sanderson's First Law2, but the Marks and Callings nevertheless play an important role in its operation -- particularly in Season 5, currently underway as of this writing.
More than one Brony rolled over a few Saturdays ago, went back to sleep when they remembered that a CMC episode was scheduled for the day -- and discovered upon awakening that they'd missed one of the Big Episodes of the Season. Given the themes of Season 5, I would not be surprised if Apple Bloom, Scootaloo, and Sweetie Bell turn out to be major players in resolving the crisis in the forthcoming season finale.
Is there a point to all this? Probably not, other than an amusing confluence of easily-dismissed side characters in obscure pop culture.
On the Other Claw, perhaps there is. Perhaps it's worth taking a second glance at the overlooked and unappreciated side characters in the media we all so adore. Perhaps there are more works where the real themes and key concepts are explored by the side-characters, since, after all, the protagonists and antagonists are busy protagonizing and antagonizing. Perhaps, in many works, all that foreground action is just a carrier wave, and it's the Big Bears and the Apple Blooms, the Merrys and Pippins, the Neville Longbottoms and the Etta Candys who really embody the signal.
1 There is also an unfortunate tendency for the earlier CMC episodes to hinge heavily on Cringe Comedy, though this thankfully diminishes as the seasons progress.
2 Did I just invoke Sanderson on top of Kirby and MLP? Trifecta!!