Met Roster

A few minutes ago I was glancing through the Met roster of singers (I really do have to get a life!) and was somewhat surprised to find that they have no counter-tenors listed. I am reliably informed that five years ago they had no less than five on the roster. What's up with that? No David Daniels? No Andreas Scholl? I am not sure what is involved in being on this roster - as opposed to being an invited n on-roster singer but I shall try to find out and see if it offers any clue as to this apparently odd lacuna.