AJ: Being younger than Applebloom doesn’t mean the rest of her class didn’t get their cutie mark first.
 
Dashie 1: They’re older than her, not in her class.
 
Dashie 2: Like someone said, she knocked Fluttershy off the cloud and didn’t even notice.
 
Spike: Okay, I’ll give you this one. But is Spike the most credible source to know the color of his own egg?
 
Pinkie: Granny Pie was never shown in the episode.
 
Dashie 3: None of them actually physically saw her do it. They know /something/ happened, but they refuse to believe she can do something that outstanding without seeing it firsthand.
 
Any questions?

Which explains why all the stories relate to each other.

@Takuto:
 
Now ya know how I feel about FPK. :(

what I dislike about this episode was how it declares Dash is the most important. Why does she deserve to be the cause of their cutie marks?

What about the cake?

Seriously i hate this pic, why?Cause this is my favorite episode of all seasons and i never see anyone saying good things about it.

Well you found me, congradualtions. Was it worth it?

ALL I KNOW IT’S A LIE!  
[Sobs in a corner]

Though the one about younger siblings is ignoring the fact that Dash completely forgot about Fluttershy during the race and even knocked her off the cloud at the beginning without going back to see if she was okay.

Next you’re going to tell me Pinkie’s story ISN’T how Equestria was made, after all.