As someone with brain injury myself caused by several severe concussions I can tell you some of what he is describing is definitely true. Fatigue is the biggest issue and is debilitating along with migraines that can literally stop me moving/getting out of bed for days on end... It took years to get it properly recognised as a disability and affects everything, from the job I do to whether I drive a car (legally I can, I choose not to) to how I relate to people. I always describe myself and life as before my accident and after... I lost a lot from it but not all of it was bad, a lot of any "side" I may have once had, be that cockiness, manipulative behaviour or even overconfidence is now gone too.
Mental health issues and personality change is there and while Benoit's brain damage is no more an excuse than my injuries are for mistakes I might make in life it's dangerous and wrong to paint him as a cold calculating killer.
The deterioration was outlined in his diaries that were much publicized and many passages release. He was delusional, to the point he was writing letters to Eddie as if he was just overseas rather than dead. While a horrific moment of clarity may have led him down a darker path once Nancy was dead it's equally plausible and likely that he really was on a different planet by that stage.
The work Nowinski did to bring the brain test results to light don't get enough credit. It's a major reason why the world and sport in particular is now uber Concussion aware. Other guys have since died but Benoit, as wrong and horrid as his acts were showed enough evidence that the concussions were a major factor, along with mental illness for there to be little chance of him serving even a day in anywhere except a secure hospital had he lived.
Does Vince bear responsibility... some but not all. He takes the blame for being anti-union and his stance on how he pays and manages talent. The lawsuits that are coming may get thrown out, but eventually someone will win and win big and then the fact he fought so hard will work against him in terms of payout amount.
But the reality is that wrestlers do know what they do has risks and have done for years, for every guy who sues there will be one who self medicated and ignored signs "to appear tough".
Someone like Benoit is the elephant in the room for Vince, it was on his watch, it was public and it was heinous... the public ultimately won't care the medical reasons/influences...they will just see a child killing monster regardless. As tragic as the deaths were of Nancy and Daniel, arguably the most tragic part is that Benoit succeeded in ending his life... had that not happened I think the picture that the evidence would have brought out would have meant more in terms of long term change...
"It was on Vince's watch".
I will tell you something interesting that I read about.
This whole thing very well might not have been on Vince's watch at all, if he hadn't interfered, and let his ego get in the way.
It is a bit of a "sliding doors" moment, actually.
Apparently, there was talk of Benoit leaving WWE once his contract was up, and going to TNA.
This was going to happen partly to his home life. Nancy was at home full-time while Chris was on the road. Now, their son Daniel had Fragile X Syndrome, a condition which requires 24-hour a day care. Nancy was home all day minding Daniel and attending to his needs.
Nancy apparently wanted Chris to retire. He wanted to still wrestle. They fought about it, but then a solution which would solve both their problems arose- TNA.
Benoit would join TNA. Now, TNA had a work schedule which worked like this at the time- They would record back-to-back episodes of "Impact", have a week off, two more back-to-back eps, a week off, then the PPV.
Also, because all eps of "Impact" were filmed at Disneyworld, a lot of TNA wrestlers moved there. Christian said in an interview that he moved to Florida when he was in TNA, and lived half an hour drive from the studios, so he could do the shows, and be home that night.
This suited the Benoits to the ground. Chris would be home more often, and mind Daniel , giving Nancy support and help. He could then still wrestle, but without the travel. The plan was to move to Florida and Benoit to sign with TNA.
In fact, TNA owner Jeff Jarrett was enthusiastic about this as well. He wanted to sign Benoit, and have a series of Ladder matches against him. Jarrett also bragged that he had just signed Angle, Chris Jericho was a free agent at the time, and he would sign him, and Benoit as well. Jarrett bragged that having Angle, Jericho AND Benoit would be a sign that other WWE guys would also jump ship to him.
Now, Vince didn't like this, when it got back to him, one bit. He saw a "WCW stealing of his talent" happening all over again, and knew how it put WCW in the game for a while. He was determined to not let it happen again. Angle had already signed with TNA, Jericho was out of contract, so couldn't control him, so Vince targeted Benoit, and offered him a rich new contract, which Benoit signed.
Now, if Vince had let Benoit go to TNA, I believe that Benoit would have done the same thing regardless. The difference is that TNA would get the bad publicity for signing Benoit, and Vince would come up smelling like roses, and may even claim that he didn't re-sign him because he thought there was something "off" about him. If Benoit had done the murders while on TNA's books instead of WWE's, it might have sunk TNA completely (they didn't have the money or publicity to withstand such a scandal), and WWE wouldn't have got the backlash it did. But byVince's ego of refusing to let someone leave, because they might jump to the opposition, actually screwed himself and WWE.