It's fairly clear to the even the novice reader. The Polar position insisted on the right of Polar crewmembers to take Atlas crewmembers seats in Atlas aircraft. Atlas argued that crewmembers who did not bring seats with them to the merged airline had no right to the seats of Atlas crewmembers in Atlas aircraft. Polars surplus of crews, brought about by the parking of their Classics, and the return of Classics that were owned by Atlas and dry leased to Polar, created a situation where pilots would eventually have a recall, but if Classics were parked, no PFE opportunities would exist for the furloughed PFE's.
The aribtrator integrated the list, yet maintained that no Polar crewmember had the right to Atlas seats in a manner that would "bump" an Atlas crewmember from his seat to the street.
Hence, Polar FE's have no right to displace an Atlas FE from his airplane or seat until new vacancies were created, post integration. (meaning the acquisition of new 3 man aircraft) Polar furloughed FO's and Captains have no right to displace an Atlas crewmember from their seat and are not eligible for recall at the merged carrier until there is growth in the fleet beyond the fleet size at the time of the merger.
It is clear that when the arbitrator "suggested" both parties rethink their original positions and come back with something else, Polar refused to move and Atlas responded, proposing other options. Arbitrators don't like people who are unwilling to seek to find common ground. Since it is their field on which everyone is playing, they get to set the rules.
As has been apparent in the course of events, it is apparent that ego overruled the responsibility of representation at Polar. The losers have been Polars crewmembers and their families at the hand of their elected leadership.
It appears now that someone more focused on representation is now at the helm for the Polar crewmembers. For their sake, it appears to be a good thing.