First off, this information seems like it would make a good addition to Copper's profile
Now, I've re-read your character, and have a few more notes for you. First, the part of Copper's personality section that says "He doesn't care for shopping, as long as it isn't long ones" is a bit oddly worded. I think what you meant was something more along the lines of "He dislikes shopping, but will tolerate it if it doesn't take too long".
Second, and most importantly, Copper's special talent still needs a bit of work. Like Randi said, his ability will need to be defined, and I would suggest doing so by clearly laying out what his "spin dash" is capable of in the "other" section. Beyond that though, he is still missing a purpose to his cutie mark. Clearly it symbolizes his unique ability, but what of it? What does his cutie mark say about him beyond "he can do this cool thing"? Is it symbolic of a passion for speed, or perhaps a desire to rush to the aid of somepony who needs it, like he did to earn his cutie mark when he helped clear the snow (hint hint hint)? This is a question that will need to be answered for you to really understand what makes your pony tick.
In addition, his cutie mark story is improved, but still seems a bit odd. The inspiration works, but the fact that he never had to work on or practice at this ability strikes me as odd. I would have him practice this at least a bit by himself first.