Thank you for providing a detailed, nuanced take.
Obviously ND is the white whale here. Lets say UNC is definitively the #2 option (not saying they aren't, but like who knows what every shot-caller is actually thinking).
Not sure where you rank Miami and FSU, but expansion historically occurs in pairs. A la "the whole is greater than the sum of the parts", us and FSU are not #1 targets on an individual basis, but looking at targets in terms of packages? I agree with your point about big slice/small pie & small slice/big pie, but what about majority stake in (arguably) the biggest pie? 4 biggest states in terms of talent are Florida, Texas, Georgia, Cali. SEC has Texas/Georgia & B1G has Cali. I think ~2/3 of Florida is worth more than NC (lmk if you disagree on that notion). Wouldn't B1G prioritizing us as a package over UNC be more advantageous? Having a majority share in Florida and diminishing SEC influence, instead of the other way around, would be a massive power shift, imo. Would surely be beneficial for us.
If the B1G adds us and FSU tomorrow and no one else, I think that instantly becomes the second best conference rivalry? For the record, as much as I dislike FSU, I hope we play each other forever. With the future of cfb scheduling looking unknown, I worry us ending up in different conferences may put an end to the rivalry.