Basically, Stevens is telling these guys that their brief isn't good enough to convince O'Connor and/or Kennedy to side with them and rule that Presdient Bush cannot make recess appointments, and that they should try again. IOW, they got a mulligan.
I guess they have to wait till Sandy Berger removes the Constitution from the National Archives and makes the following (28th?) amendment:
The President shall have Power to fill up allsome Vacancies that may happen during the Recess of the Senate, by granting Commissions which shall expire at the End of their next Session.