It's not that one ruling matters more per se - the two bodies operate within completely different arenas. Within the arena of each, they are both the final word on disagreements in opinion. In fact, SCOTUS can be over-ruled by Congress and the President if they pass a law over-ruling SCOTUS's decision. There is no higher authority than the EB as far as interpreting the C&BL's (as long as they're within legal and DFR boundaries).
No. Like someone fleeing to another country to escape a SCOTUS ruling against them, you've fled to another union to escape the EB's ruling. So the argument now centers on USAPA's ability or inability to disregard the arbitrator's decision and substitute it's own without being in violation of it's DFR duty. I've seen nothing to indicate that USAPA is arguing that the Nic doesn't comply with ALPA merger policy so would assume that even USAPA sees the futility of that.
Jim
Jim,you are a trip.