I also believe a factor to be considered is that some people are just more prone to concussions. Troy Aikman would be a perfect example. Concussions ended his career. Yet there are many quarterbacks who both took harder hits and were with more often with no issue like Jim Kelly. He wad probably hit more often and harder than Aikman. (Yes, I realize Aikman played home games on turf which is harder-- just an example)
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