This is the guy who coined the word "sack".
I heard this guy was a talented and dirty player. Heard he once faked a broken arm so he could play with a steel rod in his cast. Wouldn't get away with that sort of thing today obviously.
I saw him play. Master of the Head Slap. Tough and mean but I never heard of him playing with a steel rod. Do you have a cite for this?
As for the Fearsome Foursome, the originals were the NY Giants of the late 50's, Grier, Modzelewski, Katcavage, and Robustelli. When Grier went to the Rams the name followed. The local media picked up the nickname and applied it to Grier, Deacon Jones, Olson, and Lundy. The Detroit Lions (Karras) and SD Chargers DLines also called Fearsome Foursome.