Those 5 players, I believe, are asymptomatic which means they can’t spread Covid, hence why they didn’t realize they had it until the test. I’d bet there’s way more asymptomatic people out there than we all realize.
As to your point, yes I would much rather have kids out practicing together than continued lockdown. There are more kids being domestically abused and emotional abused contemplating suicide then are being seriously harmed by Covid. Flatten the curve was never supposed to be until there’s no Covid.