I'm guessing Matt Thorpe is second cover based on the new cast coming in. Ben is definitely one of the best understudies I've seen and for him to be 3rd cover again is quite shocking. I would say his falsetto is not as strong as others, but he's consistently been excellent acting wise - and his version of Can't Take My Eyes Off You is fantastic.
If Your Mother Were Here, Don't Ya Pinch Me Charlie, It Must Be Believed to be Seen and Simply Second Nature are my favourites - but there's nothing in this score that is as good as Good Morning Baltimore or You Can't Stop The Beat from Hairspray. Hairspray remains Shaiman and Wittman's best show by a long way.