He is not showing up for the major events
Actually, Mike, it would be far more accurate to say that he has played in virtually every event having an internationally diverse, elite field, that had at least half a dozen of the world's top 20 players. That probably means the World Pool Championships, the US Open, the China Open, the All-Japan, the World Pool Masters, the Derby City 9-ball, the Derby City 10-ball and the International 9-ball.
After his great year in 2016, in which he won Derby City 9-ball and the US Open 9-ball, here is how it's gone for Shane in these events (yes, many of these events were cancelled in the last two years). He has played in twenty of them:
2017 US Open 9-ball – 13th
2017 Derby City 9-ball, 2nd
2018 International 9-ball, 4th
2018 World 9-ball championships – 3rd
2018 World Pool Masters – 2nd
2018 Derby City 9-ball- 3rd
2018 International Open – 4th
2019 World 9-ball championships –33rd
2019 World Pool Masters – 5th
2019 International 9-ball – 13th
2019 US Open 9-ball – 9th
2020 Derby City 9-ball – 5th
2020 Derby City 10-ball – 9th
2021 World Ten Ball championship - 5th
2021 US Open 9-ball – 9th
2021 World Pool Championships – 9th
2021 World Pool Masters 2021 – 2nd
2021 International 9-ball – 3rd
2022 Derby City 9-ball - 6th
2022 Derby City 10-ball – 5th
Lack of participation is a myth. Shane just isn't winning the big titles anymore. His results still confirm that he's still a top player, but in recent years he just hasn't gotten it done in the biggest spots and is not winning the kind of titles that he won earlier in his career.
By comparison, in the same period, Filler won the China Open, the US Open, the World 9-ball, and the Derby City 10-ball. For good measure, you can add two silvers at the Derby City 9-ball, a Mosconi Cup MVP, and a win at the American 14.1, the only straight pool event in America having a diverse, internationally elite field.
Hence, Shane's results over the past five years are way, way, way, way below the work put in by Filler. Head-to-head, it's also no contest. When Shane beat Filler at the 2021 World Pool Masters, the commentator indicated that this brought Shane's record to 2-9 against Filler over their past eleven meetings (no idea whether they were right, but it sounds about right to this fan).
In short, if Fargo rates them roughly even, I don't get it.
Yours, Stu (the biggest ever fan of Fargo ratings)