Well pontious how would you define an unforseen emergency?
Would it be " a sudden state of danger, conflict etc requiring immediate action?" (Concise Oxford Dictionary).
A weather diversion hardly falls in to this category. In addition the event was not even unforseen. For over 2 hours the crew had been instructed to hold at destination awaiting a clearance that was never going to come. Ample time to replan for any ops setup with an ounce of ability.
Once they had diverted to NRT there was also still time for the company to position these individuals home on a commercial flight and send a new crew to replace them. The company chose not to do this thus precipitating this conflict.
As it happens both pilots have been re-instated with various punishments. One with loss of increments and another demoted to FO.
Elroy, the individuals have had the full support of the DPA and an inordinate amount of effort has gone towards resolving the situation without resorting to the courts.