I don't think you'll have a "fiasco", i.e. a whole bunch of players missing a game. What you could have is select players, like Lamar, missing a game or two if they test positive again.
Also, as a non-vaccinated player, he would go on the close contact COVID list if he's deemed around somebody else who tested positive.
So if Justice Hill tests positive on a Thursday, and Lamar was deemed around him, they'll likely both miss the game.
Honestly for me, the biggest risk of not being vaccinated isn't that they'll actually test positive. It's that they're around people who also aren't vaccinated that could test positive. Lamar could theoretically miss many games this year just being in the close contact protocol, and never test positive himself (even though he already has, twice).