I certainly believe that. However, I suspect the game would significantly change if helmets were removed (hypothetically). It would be interesting if I had a

I certainly believe that. However, I suspect the game would significantly change if helmets were removed (hypothetically). It would be interesting if I had a time machine, so I could go back and measure the impact of collision in the NFL game circa 1930. I think that's all the article suggests -- change the game significantly, or else start to realize that just about every NFL career player has serious brain damage, regardless of whether they suffered a concussion.