It would seem foolish to blame the vaccines but not know whether they were actually vaccinated and whether they were vaccinated close to the date of their collapse.
Vaccine cards were pretty easy to forge. If I was a 20 year-old, I wouldn’t have gotten vaccinated. I doubt those leagues truly cared whether they were vaxxed. It was just a virtue signal.
The elite leagues/teams paying the top athletes gobs of money will either have illicitly arranged for their athletes to have received placebo injections on the down low, or else will have their ways of ensuring those athletes are vexxed to the hilt with real Fauci juice, no exceptions allowed (except for the very best players).