SI has a list up of the 10 most revolutionary defensive players in NFL history. Two Bears line backers have made the list.
There were other players who redefined the middle-linebacker spot -- like Sam Huff, Chuck Bednarik and Ray Nitschke -- but no one had the impact of Butkus. The Bears legend had the speed and drive to make plays on every inch of the field. He was a monster against the run and could cover tight ends and running backs. But more important than anything was his intensity. He played every game like it was his last -- a necessary ingredient to be a great middle linebacker. Butkus' lineage includes Mike Singletary, Ray Lewis and Brian Urlacher.
And somehow he is still overrated. Go figure!