My guess is that both MECs will make their best argument on behalf of the pilots they represent, then a neutral will decide the final SLI. Because of the competing interests I don't see either side agreeing to a negotiated list. I don't think anyone would find that a surprise, however, the challenge will be: Can CAL/UAL pilots make it through the SLI process as a unified group or will they end up in two or more splinter groups?