The legally elected bargaining agent passed an illegally derived seniority list, and had the company accepted that list they would be colluding with the elected bargaining agent in their unlawful undertaking. The company has already stood before a judge and been release because they refused to accept the DOH list from usapa. To this day, the only combined seniority list accepted at LCC is the Nicolau award. I wonder why no one called him on this, but I am sure Kirby will be called on it in the next PHX crew news.
The problem with your idea is that the West pilots are not stupid. Sure we sue usapa, then the east votes in a new union, or assesses the West pilots only or whatever further illegal bs they can stoop down to. No, I do not think so. The leverage the West has is to keep the company's (the only target that is not moving and has the deeper pockets, and money to lose) feet to the fire.
Here's an idea. How about we all live up to our agreements, stop suing on another, get a better contract that includes the Nic, and share in our combined fortunes equitably.