If there's no settlement, the court will need to rule on the LTW priority status, and almost regardless that would upend the POR (at this point, any real change is going to harm a particular constituancy).
Oddly enough, the best outcome for DIME, Class 12 status, is accounted for in the current plan construct, and therefore is not an impediment or a possible impediment to confirmation.
Mediation isn't in case of a favorable Class 12 ruling.