It's also interesting to note that Notre Dame, the only school that ESPN and Fox said would increase television value for the Big 12, is presently the television partner of Comcast/NBC.
Reading the tea leaves, Notre Dame joining the Big 12 in any capacity strengthens the position of ESPN and Fox while weakening the position of Comcast/NBC. We already know that ESPN and Fox joined forces to stop Comcast/NBC from obtaining the Pac 12 television rights. Now the networks are also advising the Big 12 that Notre Dame is the preferred expansion candidate.
So isn't that a double conflict?
ESPN and Fox aren't just advising the Big 12 on whether or not it should expand to help their rights package, the networks are advising the Big 12 to expand in a way that hurts their primary rival too. It's a great business move.