CB is the most coveted position in the NFL and there is no harder position to fill. It is harder to fill than QB.
I don't understand why you have to take everything to a ridiculous extreme. Yes, cornerbacks are important. Say that and it's an accurate thing. I'd agree with it. But no, you have to always take it to the extreme edge one way or another. To say they're more coveted or more difficult to fill than QBs is just ridiculous. If you honestly believe that, you're the only person in the world who does.
Revis helped us win a Super Bowl. Sherman helped the Seahawks win one last year. So a shutdown corner is a big want for teams lately. Then again, Revis never made it to a single Super Bowl without Brady. Talib didn't even make the play-offs until he started playing with Brady and Manning. Haden hasn't been to the play-offs. Peterson, Grimes, Verner, none of those guys have gotten close because they have ****ty QBs. Even when you paired up two great corners in Revis and Cromartie, they couldn't get to the Super Bowl.
But the Ravens can WIN one while starting Cary Williams and Corey Graham after Webb got hurt because Joe Flacco played out of his mind. The Giants have won two unfortunately with Corey Webster and Aaron Ross in 2011, and Ross with Sam Madison in 2007 but they had Eli and a massive dozen ****ing horseshoes up their asses. The 2010 Packers had a Pro Bowl season out of Tramon Williams, who had been unheralded up to that point but they had some guy named Aaron Rodgers. The 2009 Saints won with a mishmash of starts from Randall Gay, Malcolm Jenkins, Jabari Greer, and Tracy Porter, with only Porter starting more than half the games in the season, but some guy named Drew Brees.
From 2007 to present meanwhile, Revis played on teams that went 44-51 without a Pro Bowl QB. The Patriots went 13-3 with a terrible secondary in 2011, 12-4 after adding a Pro Bowler halfway through the season in Talib, and 12-4 with Revis replacing Talib. Talib went 22-34 before playing with Brady and Manning. You don't even need an elite QB, just someone decent. Patrick Peterson's teams are 19-23 without Carson Palmer, 15-7 with. Meanwhile Joe Haden is 25-47, having never played with a decent QB.
I know, cornerbacks don't get judged by win/loss records for a reason, and the reason is because they don't affect the game the way an elite QB does. If I have to choose between Brady or Revis, I choose Brady 1 million times out of 1 million. If I have to choose Luck over Revis, I do so as well, simply because it's easier to win with an elite QB than an elite corner.