I personally think it has to do with brain trauma. All the blows to the head that one takes, especially at the LB position, can't be good for any player in the long term. I know there are some people who want to dispute this 'theory' but we are seeing more players, in different sports, dying premature deaths and they all have had numerous blows to the head. The NFL, along with other major leagues, need to seriously look into this epidemic. How many more lives need to be lost? That's a question I would like to see Mr. Goodell answer.