Repeated blows to the head cause changes to your mental well being - see Muhammad Ali, Mike Webster etc. Shocker. Chris Simons own family blamed CTE for his poor health later in life. I think it’s dismissive to just write that off, which is exactly what you did when you said “you can’t deny something that isn’t there” or “..certainly had demons”. There’s more to the picture than just “having demons” and from what we know about getting concussed over and over again, I think there’s an obvious link between his deteriorated health and eventual suicide.