The last time I looked at the protocols, they did not call for quarantine of every player that was in contact. They called for the positive test player/staff member to be quarantined and for the contacts to be monitored.
Now they have done some work on the Health & Safety stuff since, so I am not sure it is still the same. But if you were to immediately quarantine everyone a positive test came in contact with, you couldn't afford to have anyone test positive. So when I saw the procedure, there was a bunch of stuff about the number of tests and the type of tests and when the screening was to be done for those that were being followed after coming in contact with a person testing positive. And the main thing I remember was that all screening was to be done at home first, then before entering the clubhouse and at each step, if the person didn't pass, they were to stay away.
The idea was clearly, we will have positive tests, we will not know for sure if others were infected, we will test and screen the hell out of those that were in contact so if they were infected, we will catch it before they propagate the outbreak further, but we will not quarantine until we get an actual positive test. So you will see players still being allowed to play, even if they were in contact with someone who tests positive, until one of the myriad of screening protocols raises a red flag.