Because the Steelers are the only team to win six Super Bowls, Super Bowl rings were a requirement to be considered for the Steelers' all-time Mount Rushmore.
That's why Rod Woodson and Ernie Stautner didn't make it.
Woodson had 38 interceptions and made seven Pro Bowls as a Steeler. He also was named 1993 Associated Press NFL Defensive Player of the Year.
Stautner, whose No. 70 is the only uniform number retired by the Steelers, was a versatile defensive lineman from 1950 to 1963 and even played some offensive line. He's one of five Steelers to make nine or more Pro Bowls.
As hard as it was to exclude them, it was much harder leaving out players with Super Bowl rings.
Since the Steelers won four Super Bowls in the 1970s and just two in the past decade, three players from the 70s were chosen for the four spots.
Lambert was chosen over Troy Polamalu because of his ability to stay healthy and his impact in Super Bowls. Lambert missed just six games in the first 10 years of his career. Polamalu's missed more than that in multiple seasons and he's also been pretty much invisible in the three Super Bowls he's played.
Polamalu was still a strong candidate to be the one representative of the current era.
He rescued the Steelers with his pick-six of Joe Flacco late in the 2008 AFC Championship Game, and the Steelers went on to win Super Bowl XLIII. He single-handedly changed the AFC North race with his strip-sack of Flacco in 2010.
The Steelers might not have won Super Bowl XLIII or reached Super Bowl XLV without Polamalu, but he was put in a position to make those plays because of how far Ben Roethlisberger had taken the Steelers.
Jerome Bettis and Hines Ward also have Roethlisberger to thank for their Super Bowl rings. Ward is the Steelers' all-time leader in receiving yards and Bettis is second on the Steelers' all-time list for rushing yards.
Not only did neither win a Super Bowl until Roethlisberger came along, but they didn't even play in one. Both came after the Steelers' loss to the Cowboys in Super Bowl XXX.
If Ward doesn't make it, Lynn Swann and John Stallworth don't make it, either. Ward's 1,000 career receptions were more than Swann and Stallworth combined.
Despite his Immaculate Reception fame and status as the Steelers' all-time leading rusher, there wasn't even a place for Franco Harris. The Steelers' all-time Mount Rushmore needed more than one defensive player to represent the Steel Curtain, and both offensive spots were taken by quarterbacks.
Also left off were Mel Blount and Jack Ham. Blount is the Steelers' all-time leader with 57 interceptions. Ham's career was comparable to Lambert's. He had 32 interceptions, four more than Lambert, and made eight Pro Bowls. But neither Blount nor Ham were quite as iconic as Lambert.
So let the debate begin.
If the Steelers can win another Super Bowl or two, perhaps the franchise's all-time Mount Rushmore won't be, well, set in stone.