Technically, I really do not know, but, I suppose usapa can change section 22. However, because of the TA and the Nic, they have to get the West to go along with it. That is what I read in the 9ths, "harm Plaintiffs fear" and "unquestionably ripe DFR" comments.
Practically, no. The West is not going along, and if they changed it to put all the West pilots on top, the east would have a DFR because they did not use the Nic.
The Nic is the measuring stick by which any re-ordering of seniority will be compared. Of course RR and Swan and the like will argue that as long as there is a "wide range of reasonableness", it is a done deal. But think about that for a minute. How the heck can it be argued that it is "reasonable", even within a wide range, to unilaterally impose a new method, by striping the representation of a minority group that entered into final and binding arbitration, so that the other discontent group can ignore their commitments to that minority group and arbitration, and at the same time end up with a list that disadvantages that same minority.
So, in your hypothetical of putting the West pilots on top, does that violate the West's DFR. If it is done by usapa unilaterally, without West representation, as part of a scheme of reneging on the arbitration, it certainly does. But, usapa would not get sued by the West for doing it.