It could also be that Mantello isn't interested in doing musicals any more. He hasn't directed one since The Last Ship 10 years ago and the last before that was ... 9 to 5.
And now that I'm looking through his credits it's somewhat surprising to realize he's only directed 5 Broadway musicals total (the others being the revivals of Pal Joey and Assassins and, of course, Wicked).
