I'd imagine that the Ad people had more time to prep for Rees taking over, after all it was announced months ago.
Additionally, the average tourist-theater goer isn't all that likely to notice a difference in the supporting cast, as opposed to Nathan Lane
"Grease," the fourth revival of the season, is the worst show in the history of theater and represents an unparalleled assault on Western civilization and its values. - Michael Reidel