Bronco Planet continues this excellent series of legendary Broncos.
I had completely forgotten that Zimmerman had played in the USFL.
The story I remember about him is how - John Elway had to ride a Harley into Sturgis South Dakota to talk Zimmerman into playing his last year.
I do remember Reggie White rag dolling him once in Green Bay - about the only time I saw him beat on a football field.
Certainly the most dominant offensive lineman in the history of the Denver Broncos.