The bodies were all donated with the vast majority of them having symptoms of CTE while they were alive. Essentially, it's not even close to a representative s

The bodies were all donated with the vast majority of them having symptoms of CTE while they were alive. Essentially, it's not even close to a representative sample of former NFL players. It would be the same as people who had knee problems, then were found to have arthritis in their knees after an autopsy. I would be very careful to say that all (or almost all) NFL players will have CTE when they finish football. I have seen more research on people's brains where they categorize them in two types, ones that recover from brain trauma and others that don't. For me, that seems more likely. If you are an NFL player with the type of brain that recovers well, you probably will be fine later in life. If you have a brain that just doesn't seem to do well with that, then you could develop CTE. That would be my guess.