Sheesh, thinking about Troy Polamalu's impact on this defense when he's healthy makes me wonder if he's not the most valuable player to our defense's success. Regardless, without going there, I can still confidently say this about Troy: we as Steelers fans will never see anything quite like him ever again at the safety position.
Yes there will other greats in the years to come. Some might even have more consistent and/or longer careers. But nobody and I truly mean nobody finds ways to make the unimaginably spectacular happen so often.