Joe Greene holds at least one distinction. He was the last DL coach employed by two legendary head coaches, Chuck Noll in Pittsburgh and Don Shula in Miami.
Noll gave his ex-Pro Bowler his first NFL coaching job, from 1987-91. Those were generally mediocre seasons for the Steelers; in 1991, Noll's last season, they went 7-9, with a defense ranked 22nd out of 28 teams for both yards and points allowed.
Shula hired Greene in 1992, and Greene spent the next four years coaching the d-line of a mostly undistinguished Miami defense; they finished his (and Shula's) final season with the Fins, 1995, ranked 14th in yards allowed out of 30 teams.
Now, I don't want to say Joe Greene helped ease two Hall-of-Fame HCs into retirement, but the coincidence is sorta creepy.
WC