I think you missed the point. If a player has a concussion, they aren’t going to think clearly enough to admit they just suffered brain trauma.

Maybe you’ve been hit in the head to be this misguided.
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There are several people that feel the same way as @larrybrown43 but the players must be held accountable for their decisions. I understand the diminished capacity for decision making argument but that is not exactly sound logic. While true to a certain degree, it is no more viable than saying a drunk is not responsible for his DWI/DUI because his brain function was limited. The players are often “aware” enough to actively hide their symptoms. That means they know there is something wrong and that they might be pulled from the game. It also means that they bear responsibility for further damage. The league has a responsibility as well, but that should be limited to those situations where it is quite obvious something is wrong.

He got rocked a couple of times and quit.

I think some of it is certainly down to players suddenly realising how serious they can be. I also think some of it is down to bravado. Players want to be seen to be tough and to have the ability to play through injury. There also seems to be an element of players looking back on games where they have played badly and justifying it (to others or maybe themselves) that they were injured, or concussed.

I’m certainly not taking too literally any anecdotal evidence of playing through a concussion that far in the past.

I think you missed the point. If a player has a concussion, they aren’t going to think clearly enough to admit they just suffered brain trauma.

Maybe you’ve been hit in the head to be this misguided.