Yes, the list has been accepted, but what choice did Parker have? He was obliged to accept a list that was "acceptable" according to the TA. Does that mean that other ways of seniority integration are somehow precluded from meeting those criteria, and therefore also contractually "acceptable?" No. Not at all.
And if you have been paying attention to Parker for the past few months, he has been broadcasting that to the PHX pilots who are too blind, or too stupid, to see it. He has said in the past few months that seniority integration is up to the pilots. If he thought it was settled and the "Nic is it," as you west whiners love to say, then why won't Parker say it?
It's because he knows that other methods could also be contractually acceptable, in which case he might be obligated to accept a different list. Parker said we could do it alphabetically for all he cared. As long as it doesn't cost the company bucketloads of money, it would be accepted.
Parker's "acceptance" of the Nic list is merely the company's acknowledgment that it meets the TA criteria for financial concerns. NOTHING MORE.
Sorry to disappoint your "reasonable expectation," but stomping your feet yelling that the Nic must be used may make you feel good. But it is wasted energy (and money.)