There is a reason to consider the whiplash as also a cause of some returning symptoms. The sudden braking in a car can cause both a traumatic movement to the brain and a strain to the neck.

It appears that Colorrado is trying to hold to the idea that concussion symptoms are only due to the bio-chemical cascade that manifests.

The physical trauma to the axons and dendrites has been imaged. I posted a link to an article of such imaging last week.

I believe these physical traumas leave the axons and dendrites sensitive to the rapid changes in motion. It does not take much strain to cause the confusion that often follows these jolts.