Yeah over 25 are rare.This is my 40th season chasing roosters: SD public land, with a 6-year hiatus to central IA.
Tails 23"-24": A couple handfuls.
Tails 24"-25": 3.
Tails over 25": 0.
Yes, genetics obviously come into play, but so does age.
For a rooster to see a 3rd hunting season is pretty rare.
I'd think that 28" tail came from a bird in his 2nd season. Possibly 3rd. He just had uncommonly good tail genes.