I would like to know the history of the other organizations, I believe APA was formed after a disagreement with the other members of ALPA over who should be the national president. USAPA we all know how that came about, essentially a disagreement with the SLI, the others I have no idea why they chose to become independent.
Additionally I think if we can get 51% to decertify a union, we should also be able to change our own DALPA group to meet our perceived needs.