The RLA situation with Allegiant is a bit more complicated since (I believe) there is no existing CBA between the pilots and Allegiant, so the Captain cannot rely on some rights customarily written into CBAs.
Not being a labor expert I'm not even sure what the minor dispute process is without a CBA. Anyone know? This may have been an additional factor of why the suit was filed in Nevada under state law instead of in Federal court under the RLA.