The way I understood it:
Penalty/buyout/whatever you want to call it money owed to the Big 12 from Nebraska and Colorado: How much this money is and whether or not it's collected is entirely up to lawyers to decide. Any such money (which the Big 12 is NOT guaranteed to even get at this point) is not part of any negotiations amongst the remaining member schools.
Intersting side note -- I think Colorada will get 1/11 of Nebraska's penalty if it's true that Colorado is leaving in 2 years where Nebraska is leaving next year. Then the remaining 10 schools will get 1/10 of Colorado's (much smaller) penalty. All subject to litigation, I'm sure.
So what's this "earmarked" money? I understand it as a "minimum guarantee". The current TV contracts will not be changed because there are 10 teams instead of 12. As a result, there will be 1/6 of the TV money (Colorado's and Nebraska's 1/12 share each) that will now be available for the remaining 10 teams. The 5 teams have said that their share of that additional revenue will be available to the conference as a bargaining chip for the conference to give to the 3 teams -- if necessary -- possibly to compete with other conference's offers.
So in theory, the 5 teams could end up giving up absolutely nothing -- if TV revenue goes up enough that the 3 teams don't need "more". Also in theory, our TV revenue should not go down from what it currently is -- so the worst case scenario (if I understand correctly) is that we continue to get just as much TV money as we get now.
The expectation is that all schools will get more money than they are getting now -- but it will possibly be even more skewed in favor of the 3 schools (Texas, A&M, Oklahoma).
But as Jamie said (paraphrasing) -- if we have to get Texas a $9 million increase from $14 million to $23 million so that ISU can get a $5 million increase from $9 million to $14 million -- that's an easy decision. You can't look at it as money we're losing, but money we're keeping/gaining -- especially compared to the alternative (non-BCS conference).