I don't have arbitron dates in front of me, but if through 1/2/08 was unrated, why not give your jocks vacation when you're NOT in a book, rather than give them time off DURING a book?
Again, programming basics. If a tree falls in a forest, but there's nobody there to record it makes, does it make a noise?
And if a jock goes on vacation when there's no diarys to record that you listened to something else instead, does it make a sound?
Letting a jock take a vacation during a ratings period could effect your ratings. Letting them take one when there's no ratings, ipso facto, can't effect your ratings....