Most NFL players played hard in High School and College, obviously before they came to he NFL.
I would bet they had concussions in High School and College before entering the NFL.
But the NFL has the deepest pockets so I expect the lawyers to put it all on the NFL. - Tom
I had a severe head injury back in 1977. I spent a month in the hospital on constant Dilantin pushes into my IV's every four hours. There are things that happened around that time period I still cannot process to this day. I saw a movie that week before the accident and I can watch it a hundred times thirty years later and cannot tell you anything about it after each time I see it again.? I travelled to a horse show in Belgium the month before, and have been there two more times but I cannot remember any details whatsoever.
The brain is a very strange processor. A very bad horse jumping accident damaged mine.
A traumatic brain injury lasts a lifetime. Your brain rewires some things over time, but some things don't come back or recover.