Sometimes, at the drop of a hat, our destiny can change. Sometimes, we don’t even notice it, and what we end up with is something that doesn’t belong. Even after our true friends step in to right what was wrong, a false destiny can leave something behind, and all you can do is ignore it… or embrace it.
Actually as far as I know this wasn’t too far off the mark. But, the Mirror shy should have been an Earth Pony instead. Had this actually happened then we’d have lost Pinkie Pie, and gotten Surprise instead.