Pre mass steroids guys were smaller and impact and collisions were much less severe.
Pre-steroids interior defensive linemen were slow and fat. They didn't run down RBs from behind 8 yards down the field or didn't chase them to the sidelines. For the most part, LBs didn't either, some but very few.
Greater muscle mass leads to more force on contact. The sheer strength of players now is causing collisions that rival car wrecks that's where the head traumas are coming from IMO.
If they are going to turn over every rock in search of an issue why not start at the place that is well known to allow the human body to grow and generate abnormal strength which leads to excessive force.
This message has been edited 1 time(s).