Thats a good point, and I think in general I think using professional sports as an example either for or against unions is a bad faith argument because of the unique dynamics present.
Maybe that's what makes it a great example. It shows labor unions are extremely flexible tools that should be configured for the work force they're representing.
Maybe its all these specific arguments against unions, like "seniority based promotions make for incompetent leaders" and "high performance workers are disincentivized", that are actually the examples given in bad faith.