I suspect that means you are on the inside and don't see it most of the time.
I played tennis. At one point I could, and did consistently in tournaments beat about half the county squad. I was never asked to join.
What was the difference between me and, for example Kate, who I'd always beaten easily 6-2, 6-2 or better)? I was several levels up on the rankings too. She played in the same club as the county squad's coach. All the others had similar reasons.
And that was one where there was an absolutely easy way to check.
I'm not, not was I then, that bothered I didn't get to play. I got plenty of other games. There was a certain satisfaction in beating his squad in tournaments matches in front of him though.😁