Good thing you used a 2011 article from Pro Football Focus because if you'd used their 2012 write-up, PFC would have had Peterson as a top 5 CB. https://www.profootballfocus.com/blog/2012/10/25/snapshot-nfl-passer-rating-allowed-cornerbacks/ Second-Year Standouts The cornerback class of the 2011 draft may go down as one of the best in history, and has had some players explode onto this scene this year. Patrick Peterson, Prince Amukamara,Chris Culliver, and Richard Sherman have all been top-flight cover corners this season and all are in the Top 10 in NFL Rating Allowed. Combined, they have allowed one touchdown and intercepted eight passes. What they have done is nothing short of amazing, especially considering that Sherman was the only one to have a positive coverage grade last season. This has the chance to be a class that, much like the receivers of 1996, the quarterbacks of 2004, and the tight ends of 2010, people talk about for a while.