I don't know. Tua could elect to retire based on medical advice and then sue the hell out of the NFL, Dolphins, medical staff and anyone else involved. Public opinion would be on his side and imagine the amount of money he could get.
Have to hold the medical evaluator responsible. It's his job to make the call and protect the player (his patient) from returning to the game. I'm sure every player will say he's ok to play but the evaluator has to protect the player from himself sometimes. It really is crazy to not think he was concussed