I think the flutterlane shipping is odd. Honestly I can't really think of a good shipping with Fluttershy.
But I can think of a better one for Thunderlane thunderchaser for instance.
Caramel and Applejack- agreed.
Rainbow Dash and Soarin- agreed.
I'm more toward the Twilight and Flash shipping and the Fluttermac shipping.
Don't know about Rarity.
I kinda lean more toward Pinkie Pie and Breaburn.
That's just my opinion.
Breaburn and Applejack are related.
And yes, Thunderlane saved rarity, but wouldn't you?