First of all, FSU and Miami haven't been on the same page as institutions since Bobby retired. Once Bobby retired, FSU started acting like UF, and Miami resented that for good reason. This is why Miami has been sitting back, and not flapping publicly, we may share a common goal but we are going to do our own thing.
Miami and Clemson may have similar interests, but it's not like Rad feels as if he owes Clemson anything. Miami may be content to let FSU and Clemson flap their gums, knowing that there's a B1G invitation in the cards once FSU and Clemson negotiate their way out(The ACC is going to eventually cave, who wants to keep a school around that obviously doesn't want to be there), while also doing the conference a solid and let them backfill spots that are going to be open in the near future. Miami didn't do this out of the goodness of our heart, we did this so when we bail, the buyout will be significantly less.
Frenk didn't do anything without Rad and Rudy having a voice, people forget that while Presidents vote, it's really a proxy vote for the ADs. Frenk likely asked Rad, Rad told him what the deal was(If we vote yes, this is what we get), and he voted accordingly. FSU and Clemson share a common interest with us, but we have to act in our own best interests.