aqua,
You are correct that the West pilots can't directly negotiate contract terms with the company because the RLA can only recognize USAPA as the bargaining agent for the entire pilot group.
The West pilots individually or in groups can always discuss with USAPA what contract terms or proposals they would like USAPA to present to the company. Both USAPA and the company will likely soon ask the court to strongly "encourage" the West to participate in mediated talks. Both USAPA and the company want mediated seniority negotiations between the West pilot class and USAPA to try to reach a mutually acceptable seniority settlement which would then jointly be presented to the court. If the court approved the settlement it would then be presented to the company by USAPA included in a contract proposal to be ratified and implemented.
Of course the West pilots don't have to show up or they can show up and insist on Nic which is the same thing as not showing up.
underpants
The western will do another charge into the Wye River, and emerge wet and with the same outcome. They are not very good at compromise, and your best course of action would be to never, ever get an agreement with them. Of course they will make that very possible. The longer their bottom pilots insist on an action that the senior western do not agree with, the more likely they are split away in a merger. That would be good for all involved.