I think you mean the award, on page 3, says the US MC gave up on DOH - hard to abandon a position after the award is out. Otherwise, I notice "our MEC" in there several times. As I said earlier, an apathetic pilot group that let the MEC do whatever they wanted. Oddly enough, abandoning DOH was what the US pilots wanted in the Shuttle merger - better for the US pilots since it would have been difficult to escape recognizing the Shuttle guys EA DOH.
It's amazing that the US MEC supported the change in merger policy in the early 90's...well, not so amazing since US had a large number of relatively new people at that time. When the stagnation resulted in having the group with the greatest average longevity, meaning DOH would be advantageous for pre-merger US pilots in any merger, the attitude changed - how dare ALPA not have DOH as the standard. Just like that list of mergers you gave - the original US pilots profited by DOH in every post deregulation merger up to the Shuttle. DOH wasn't so attractive in that merger since the EA guys could trace their DOH back to EA, so pay rate became the "gold standard" there. Now, DOH favors the East so has again become the "gold standard".
Jim