Whichever way a merge/joining/welding/smashing or whatever else you want to call it of seniority lists is carried out it will always end in some group or another being disadvantaged.
There is no way of keeping everyone happy!
The guys in the right hand seat of the domestic jets, who had no say in the long haul EBA felt that their ability to move to command was being compromised by the inclusion of the cruisers, the cruisers thought they were being shafted, the long haul fo's who thought they would get long haul commands were upset because the upstarts from domestic took their commands, the 330 pilots were upset because the first vote got defeated, in part because of the seniority list stuff, and it cost some of them more than 25 k in lost back pay.
No one group is entirely happy and no one group is out to shaft the others, compromise is the name of the game and the unfortunate thing is that realpolitik is alive and well. Many cruisers are able to move out of the back seat into a window seat because of advantageous clauses in relation to freeze periods that do not apply to any other work group so it is swings and roundabouts..
But the thing to remember is that we are all one pilot group and sitting there taking pot shots at each other is a waste of effort and just breeds unhappiness.