Er... no one else can dream of performing? Mao, Mirai, and Caroline have all also done this spin as well (a few others I believe too). Yu-Na might have made it her signature, but it isn't "impossible" for everyone else (especially since it's been done hehe). Yu-Na also needed more variations in her repetoire considering her lack of a solid layback or Biellman (although I think I've seen enough so many these past few seasons to last a life time... the nice ones like Mirai, Caroline and Mao's are great, but so many look bleh). Yu-Na's centering is nice and her speed is average, but she certainly isn't up there with Alissa Czsiny or Caroline Zhang on spins. The one thing I do like about her spins more than others are the clear transitions, since some skaters can be quite sloppy when they transition from one position to another.