Well for one they said they wanted to do it by pay and relative position.
It's done by comparable category and status. If it was done by comparable pay all DAL 777 and 767-400 captains would be senior to all NWA pilots, 737-800 pilots senior to NWA 757 pilots, MD-88 pilots senior to A320/19 and DC-9 pilots. We didn't do that.
The last DAL pilot hired is 500+ numbers senior to the last NWA hire. That is nowhere close to relative position and also the 747 SO position was put at the bottom also, even though it pays more than most of the Narrowbodies.
In the DAL proposal the second officer position was integrated with large gauge domestic first officers in 767s and 757s.
They didnt put all the NWA guys at the top because the pay and size of the 747 is the biggest so why is ok on the bottom but not on top?
The 747s pay less than 767-400s and 777s. Nevertheless, they received equal value and both the NWA and DAL "super premium" flying was treated equally.