Here's some relevance.......in the case of the DL/NW merger I believe the biggest differential in DOH was about 5 years. They now enjoy a joint contract, an active combined seniority list, and a fully merged airline. All this behind them now with a company moving ahead for the benefit of everyone.
Just like here at good old HP/US, right?!!! Moving ahead as one big happy family, no?!!!! Well maybe......just maybe, such an 'irrelevant' issue as DOH (or the lack of any consideration thereof) has something to do with the reality of our situation. And speaking of the reality of our situation, contrary to your statement, many who hold the ultimate authority (i.e.; a vote) have more than a little concern for DOH or at least some consideration for their dedicated years of service.
Now, while I know that the last three years has been nothing more than a futile little distraction for the West, the relief that is coming may be anything but comical!