These are false results based on false assumptions. They shouldn't even consider team sports like football or baseball with individual sports like badminton or tennis. In most team sports, each member plays a different role thus requires different skills. A quarter back has a very different skill set than a linebacker. A hockey goalie can’t play forward, etc. In sports like badminton, all the skills are encapsulated in to one or two people. It’s like comparing oranges to apples.