I agree Kwan is not at all stocky. What I had in mind was more of a comparison of someone like Harding to someone like Kim.
Kwan is toned and slender, but her limbs are definitely not as long as someone like Yuna's. I tend to agree that longer limbs create more pleasing lines, but I look at things from a dance perspective and some people focus more on athleticism than on "dancerly" qualities like line, stretch, pointed toes, etc.