It is extremely difficult to explain what does, or does not, make a great flamenco dancer. As in all flamenco, duende and gracia are prized possessions, followed by an instinctive compas and an underrated "good taste." Other than these essentials, there are not any clearly defined techniques that have to be used. It is strictly up to the dancer to use whatever technique he (or she) wishes, in whatever manner he wishes, within certain broad limitations, as long as they help him to express what he feels, whatever he is striving to communicate.
D. Pohren/The Art of Flamenco