Morris Neighbor - all good points, of course. I am curious - are you saying you saw Karsavina dance? When?
Profuse (and significantly delayed!) apologies. I never saw Karsavina, and wrote a careless message that left this fact regrettably ambiguous.
I have seen Kent, in mind-boggling experiences. Her Sonnambula is the performance by which all others must be judged: ethereal yet concrete, spiritual yet real. There's a Canadian kinescope of her performing the "Adagio" from Symphony in C in less than ideal circumstances (a mini-stage in front of an orchestra) that shows the same gifts: she takes us to a different place, one that floats a few crucial inches above the stage.
Her post-retirement interviews make her seem simply spacey. The judgement is not unfair, merely inadequate for such a long and rich career. She deserves a lilly. She deserves a bouquet.