Just for fun, let's say I'm correct. You are the owner of the Nets. You have a crystal ball that lets you see that without Kyrie Irving the Nets will finish .500 and out of the playoffs but with Kyrie Irving they finish as the #2 seed.
The vaccine requirement is not in Kyrie Irving's contract. He's agreed to be tested every 3 days, he's young, extremely cardiovascularly healthy, and you know Regeneron is highly effective when you catch infections early. Given his health, the level of medical care available to him, and because breakthrough infections are a thing he's not at any higher risk to cause an outbreak than anyone else on the team. This is a power move, to force Kyrie Irving to accept a condition not in his contract simply as an outward show that you are on "team vaccinate".
As the owner of the Nets with your crystal ball, do you voluntarily cause your team to miss the playoffs to virtue signal?