Where did you read that "experts agree, the vast, vast majority fully recover" ? There is a big difference between becoming symptom free and fully recovered. One of the standards often used for recovery is simple. Does the patient stop complaining and asking for care or treatment ?

Studies also show that those athletes who recover to their baseline in Computerized Neurocognitive Testing (ImPACT or CNS Vital Signs) still show signs of brain injury weeks later with other testing systems.

It does not mean we should lose hope. Just that our hope should be realistic and we should be careful about the risks and stresses we take on in our future.

85% recover from all symptoms within 6 weeks or so. But, this does not mean they can tolerate stressors without a return of symptoms.