Not really a question but did you see the Harvard study

[rob]

"people who reported sports-related concussions had a slightly better cognitive performance than those who reported no concussions, suggesting that the physical and social benefits of sports may outweigh the risk of concussion for amateur athletes."

https://www.cbsnews.com/boston/news/concussions-amateur-athletes-cognitive-decline-harvard/

[Bobref]

It’s noteworthy that the study is based on self reports of concussions, not medically-diagnosed concussions.