The ALPA seniority list ruling will have no impact on other labor group integrations.
However, there is significant east pilot resolve to not obtain a new joint contract. Thus, if there is no joint contract the two companies cannot be operationally combined and management will not obtain the final merger cost and revenue synergies.
If ALPA East takes this action then management will have less motivation to reach combined contracts with the other labor groups, which could mean no pay raises for the other unions.
Regards,
USA320Pilot