Here's where I disagree with you. I believe Brady absolutely would conceal, has concealed, and will continue to conceal minor concussion issues, as would, and has, every athlete in the NFL.
Not every concussion is an obvious injury. Not every concussion is a Concussion. We have systems set up to catch the big ones, but what about the little ones? Is Brady supposed to report every time he gets his bell rung? Every time he gets hit hard enough that he's seeing stars or a bit weak in the knees for a minute or has trouble refocusing his eyes for a few seconds after the hit? Because each of those is also a concussion, and each one contributes to the cumulative repetitive injury effect that is CTE. But this kind of little-c concussion is simply something every player in the NFL gets to deal with in a contact sport where the goal is to get the opponent to the ground by any legal means. There is no way to reform the sport of football to avoid minor concussive events.
The guys who are having the worst time with CTE aren't the guys who got their bell rung one, big time. It's the guys who got rung a lot of little times. Again, is Brady supposed to report every time he has minor concussion like symptoms for a few seconds after a hit? Of course not, that's nonsense, half the team would be reporting issues every single game.
I think that's the central point that people are kind of groping around. What is a concussion and what is a Concussion. Because failing to report a concussion and failing to report a Concussion are two different problems, and it's a tough area for an athlete who's trying to focus on competing in the league to really get a handle on and try to answer. Because Concussions, the big ones, the major damage that can wreck a player's career if it's not taken care of immediately, are absolutely the league's problem, but every little concussion, every little brain bruise that simply happens in a contact sport like football, probably is not.
I think it's entirely possible that Giselle, worried about the cumulative effect of 16 years of being dinged in the head a few times a game, spoke out about Brady not reporting concussions, and the media leaps to the conclusion he isn't reporting Concussions. As in he's taking big injuries to his brain and trying to play through them which isn't happening. And it's going to be hard to be specific enough to talk the media around right when they're pursuing the "big" story as hard as they usually do.