I don't know how anyone can not think its both issues related here he was prob having a ton of issues related to brain damage guy played 20 years at a extreme high level and contract position. I played 4 years and i would guess had maybe 2 concussions 1 somewhat serious and i can tell you they are damaging in all affects.
The only thing i can even remotely relate to to anyone who hasn't had a bad one is a extreme hangover only worse with mental instability, vision, body function.
I have no doubt its this on top of the life style issues he could feel he has no place without the sport he has been apart of, add the $ issues the loss of his ex wife. It doesn't have to be extremely bad it just takes 1 second of fuck this pull the trigger or drive off into a wall or cliff. Some people act like its so fucking hard to do something like this once its done its done.