That's not evidence. The CBA for example, guarantees the right for a 2nd opinion from a doctor of the player's choice paid for by the team. The only requirement is they see the team physician first. They also have the right to not see the team doctor and pay a doctor of their choice for medical treatment with the only requirement being the team is provided a copy of medical reports.
If this was such a concern for the player, why didn't he bring this up in the media at the time? He says he knew he was getting bad advice, but he took no action?
Like I always say, the NFL should give the players a dose of what they say they want. Have players be done after 1 concussion. After all, it's so risky to their long term health. Give them automatic second opinions from NFLPA doctors paid for by the NFLPA and if either doctors says they should sit then they sit with no exceptions. Let them take whatever drugs they want.
It's shocking how these concerns always become concerns after the fact. Usually, when the money is getting tight.