Simple way to handle the last part. Players are on scholarship which is, at minimum, implied contract. Players on the roster as of last regular season game or CCG must also be on roster for any playoff game(s). Any teams that has players begging off (other than legitimate injury) is DQ'd. from CFP.
I get the part about the kid from ND getting injured in the Fiesta Bowl. But let's face it, it can happen at any time, in any game. But a kid on scholarship deciding he doesn't want to play? Schools shouldn't be able to abandon kids who can't play by dropping them from scholarship because they're injured. And a kid blowing off school shouldn't be playing at ANY time. So a kid blowing off a bowl game shouldn't be kosher, either.
Hell, Wiegers KNEW he was transferring before the season ended, but he stayed through the bowl game in case anything happened to Stanley. THOSE are the types of kids that should get headlines, not prima donnas and spoiled brats who don't want to play in a bowl game because it "doesn't mean anything".