There's only one Cassie and her name is Donna McKechnie. I'm sure a number of dancers have been able to come close to her performance though.
And sorry, the Bennett choreography for "The Music and the Mirror" is one of the most outstanding Broadway has seen. That's a fact, not an opinion.
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"