Can Someone Explain How This Makes Any Sense

So they made a big deal out of Gretchen taking over all three hours of Fox & Friends and Alisyn moving the weekend and it was supposed to start after Alisyn returned from vacation. So Alisyn returns from vacation and then the very next week Gretchen is now on vacation so Alisyn is now filling in for Gretchen for this week. Why the hell couldn't they have waited until everyone finished their vacations?