Instead of all the anecdotal stuff here's some concussion science.
https://www.ncbi.nlm.nih.gov/m/pubmed/12855924/
This study suggestd that a loss of consciousness (which Bennett's symptoms could fall under as an umbrella term, with his obviously being more mild) did not predict post concussive symptoms.
I'm guessing Peters was referring to a normal SCAT test for Bennett, which is our diagnostic criteria for a concussion. That would be good news.