Thank you for posting this. I've been hoping someone would. David Alvarez played Billy the first time I ever saw the show in New York. I'm happy to see he is still in top form as older Billy.
He was amazing. I've seen eight different Billys (2 in NY, 3 in London, 2 in U.S. tour, and 1 U.S. regional production). David Alvarez is tied for my favorite Billy ever (with Nat Sweeney in London).