There is ample evidence that a brain that is not fully healed is more susceptible to re-injury . From the CDC
While you are healing, you should be very careful to avoid doing anything that could cause a bump, blow, or jolt to the head or body. On rare occasions, receiving another concussion before the brain has healed can result in brain swelling, permanent brain damage, and even death, particularly among children and teens.
No one knows when the brain his fully healed. From the NCAA
It is noteworthy that all return-to-play guidelines are consensus-based and have not been validated by evidence-based studies
He's a 22 year old kid, who might give the Gophers a 95% chance of winning Saturday instead of a 93% chance with Rhoda. But this is a heck of thing to debate and mock, everyone