You beat me to it. PBS only honors seniority “within feasibility “. It strives to complete the “solution “ so if you happen to be below the “splat”, you might find the trip you want on someone’s line way below you and if you are slightly below the g line, you basically have no seniority as pilots anywhere below the g line bidding for a line randomly get lines or don’t get lines of flying as the system is constantly optimizing during the run to try and complete a solution that awards those above the g line lines as close as possible to bid group requests. The guy 1 number below the g line might get reserve, even with the same absences/carry-in/other non flying credit as the guy 17 numbers below him who also wants a line and has opened his/her net just as wide. Nobody can(or is willing) explain it.