Yes, let's talk about the corps and Swan Lake. I've seen about 10 Swan Lakes over the past few years here at the Met Opera spring season, and just love watching the swans every time, they are so beautiful and mysterious and amazingly swanlike. The "swan" effect, by the way, is much more pronounced when you're watching from one of the balconies, rather than the orchestra.
And re Marcelo Gomes doing Von Rothbart.... I saw him towards the end of last season doing Von Rothbart in the Ananiashvili-Bocca Swan Lake, and while they got tons of applause, he pretty much upstaged them... he was, as you say, mesmerizing. Re Nina, now I'm wondering... could that have been her last ABT performance? I hope not.