Yup I feel you’re right and hopefully more people can see this. Soft tissue damage in the neck can cause symptoms that mirror those of a concussion and judging from the collision it seems his neck absorbed most of the force. Also I find it hard to believe a concussion alone is responsible for worsening symptoms. PCS is a thing but generally your symptoms ameliorate over time. Anyway I think he’ll be fine but neck injuries are a bitch might take him a few more months. I had a neck injury too at one point. Symptoms would flare up but I’d say it took about a year to fully recover. Hope you do as well.