This isn't rocket science, and the "thinking" of a poster here isn't going to matter much.
😀
If Judge Silver establishes three pilots groups that must decide on seniority then it is obvious the Nic will prevent a three-way agreement---All three groups will never agree to use the Nic, and all three groups will never agree to use something other than the Nic.
Regardless of what Silver does, someone is going to appeal. One side wants Silver to intervene and provide an injunction about how the pilots can proceed, the other side wants the court to leave the union free to perform its duty of representation to a final product.
Meanwhile, everyone enjoys their current seniority (or not) and everyone dreams about a pay raise, damages, or lottery tickets (or not).