It kind of meaningless because the Networks are paying for inventory based on 9 Big12 games.
Sorry to say this, but you continue to miss the point. The inventory in terms of number of games is the same with 8+2 as it would be with 9+1. Every Big 12 school would still play five games against a Power 5 team with the media rights under its control (i.e. either home games or neutral site games where it is the "home" team under the Big 12 media rights deal). Fox and ESPN would have a better ability to set up those games, and the schools could choose their level of opponent, too. Everybody wins.