If Ulbricht is one of the best ever in the Sonnambula Jester, and he's available, why not have him do it? In the first week - Tuesday and Friday - that's all he has for the week. Without those two Jesters he wouldn't be out there at all, for an entire week. What a waste. Having him do it is a gift for the audience. To see what that variation is supposed to look like and how it momentarily lightens what is a very somber ballet.