I have just finished listening to Coach Tomlin's comments. They are fair as well as a good position to take.
I am not a doctor of medicine and am only coming from a common base that anyone can have.
Regarding comparing different types of injuries, ranking or whatever is as much a matter of opinion as anything.
While all injuries heal if allowed to does not necessarily mean that problems will not develop later on because the injury occurred. Many injuries can lead to arthritis or other motion limiting results in the long run they do not effect the brain negatively.
I think, nevertheless, that head butting should be minimized if not eliminated, if at all possible. What concussions seem to lead to, in the long run, is debilitating in the extreme. In this case the negative results effect the brain. An example is the boxer M.Ali. Therefore, I support the NFL's efforts to minimize concussions by making head butting illegal and placing heavy fines on those who do it.
Best.
