Sure you are, look at boxing. It's a perfect example of participants being allowed to continue even while concussed.
So long as you can stand up and keep your balance before 10 seconds you're good to go.
Are the athletic commissions to blame for their assigned physicians allowing a fighter to continue fighting when he's likely suffered several concussions? Those are the agreed upon rules by all participants.
Anyway, if you're singling out two parties in your lawsuit as being liable for someone's death, then you'd better have some strong evidence that yes, the bulk of his brain damage was in fact due to them corroborating to keep his deteriorating brain a secret.
I'd feel much more comfortable with the lawsuit if they wanted to include the NCAA. They aren't though. They're going after the smallest part of his football career that just happens to be the most lucrative.
If, by some small chance they win anything, I'd hope there's a way for Odin Lloyd's family to take every cent in a civil suit.
I think the major difference here is that there was a legitimate conspiracy to misinform players and the public on football related head injuries for DECADES.