Football has had a fascination with the morose when it comes to handing out monikers to the game’s greatest defensive platoons. We’ve had Steel Curtains and Doomsday and Purple People Eaters. There were the Killer Bees down in Miami. Detroit and Los Angeles—when the NFL actually had a franchise there—shared the alliterate name Fearsome Foursome. Pro football games are won in the trenches, they say. Rare is the championship team that doesn’t possess a solid line, both on offense and defense. L...