This is nothing new. Virtually all of the current Eagle ALPA reps are much more junior to the flowthroughs and previously attempted to dream up a plan to force these senior pilots over to AA, many against their will. They even found sympathetic supposed negotiators (some of whom were not) of the agreement to support this idea.
The arbitrator found it to be incorrect, but since then many of these pilots have concluded that Eagle ALPA cannot be trusted to look out for them which is understandable. Supposedly ALPA has stated their lawyers reviewed this letter and found it to be completely innocent......................big surprise.
The Eagle pilot group is fragmented into various factions and is infested with apathy. Even various LEC councils are frequently at war with the DFW council a virtual battlefield over the last several years.
Eagle's pilots are in pretty sad shape and that's not likely to change anytime soon. It's going to be a very rough road ahead for sure.