Leaving Tara out of the credits and out of a few episodes may be a classic case of mis-direction. While the audience is focusing on Willow-Tara something else may occur.
Why didn't Buffy want Giles to buy the Magic Box? Because the owners have the life expectancy of a Spinal Tap drummer(?). Anya is now running the store.
What if it is Anya that is non-essential, she leaves which opens a spot in the opening credits?
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Willow: ...or-or to do that thing with your mouth that boys like.
Buffy snaps her head around at Willow and gives her a shocked look.
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