Wow, walk away for a bit....
I side with Ghostlight, I think that Goldyn is a FANTASTIC performer, but her Cassie is way too young and while she is dancing the patooey out of the role, and was the strongest singer of all the Cassies in the revival, it does come off more as Goldyn saying "Hey look at me" not Cassie.
I do agree that the dance needs to be acted. However, I had never considered the flying mirror section to be a moment of her discovering her deep passion. I think it was just her moment of quasi-surrealism of, these are here. I can use these to show myself off. I think she is already aware of her passion. I read, one time, that this section was also what Zach saw in his head. A dancer so in tune that the music, mirrors and body are all synced up. I kind of like that.
I don't think the second point B12B mentioned is where she really proves herself as a "star." She needs to have sort of a "Now, I am going to knock your socks off" but where I think she really does it, and is missing from the revival, is towards the end when the footlights come back up and she does the turns back and forth to the mirror, and then does the hip shake. That's when she's saying "I'm a star, and if you didn't know it, watch me do about a zillion crazy turns, fold myself in half and then do them again!"
One thing a lot of Cassie's do is smile. Smiling, for me, only works when it's a natural "I'm doing what I love" smile and not a "I'm smiling because when you smile big and do jazz hands they don't notice your feet an audition!" which Goldyn, Richert and to a degree Nikki Snelson both did.
This is probably my favorite moment in ANY musical. I think it's interesting to see what the different women do with it. And, the more I look at Clark, the more I am inclined to agree that she is technically spectacular, but she isn't acting he piece. Goldyn is close, if she could lose her self in the role more (in 10 years, I would love to see her return) and I partially wonder just how much rehearsal time she had for the role. Would she have grown into it more? I think so.
This was a bit all over, but yea.
Oh, and PRS, the mirrors turn around when she starts the dance, and then just after the song break, the others fly in, until the tempo picks up, and they fly back out.
http://www.youtube.com/huskcharmer