Right but why not a specific carve out instead of a loop hole? If it's called "men's" the intention is clear.
If it's called "mixed league" the intention is clear
If it's called "mixed league" the intention is clear
So maybe I think what they mean by "mixed league" is not a "Maybe Mixed League" but like "Definitely Mixed League" as in mixed participants being a strict requirement somehow?
Mixed league works fine for your company softball team. Not so much for professional sports.