Personally I think it's incredibly dumb for a player to miss games if they test positive, ARE fully vaccinated and feel completely fine.
But you might say "but it's so he doesn't spread it to his unvaccinated teammates or coaches." Maybe I'm just a cold hearted, SOB but if those people chose to NOT get vaccinated, then how is it fair that a responsible, fully vaccinated person has to miss a game and pay the consequences. I say let him play, and if the idiot anti vaxxer coach or player gets Covid, then they reap what they sow.