The Spoodles Pizza Window is definitely listed as participating on the plan in the brochures, as both a snack location and a CS location in 2006, and as a snack-only location in 2007. That, combined with the assumptions the OP made, makes me think that perhaps there were too many guests who were expecting to be able to use a CS credit to get a 16" pizza, so that in 2007, there won't be any confusion: It'll just be a snack location, limited by the $4 limit. (Keep in mind, though, that individual slices of pizza are less than $4 -- at least they are this year.)
Either that or they haven't finished putting all the dots into the table in the 2007 brochure, yet.