Patrick Peterson might be the most gifted athlete of any of the young players and the Cardinals did use him to track receivers last season, but other than a couple of games, we didn't really see the indication that he was able for it, and he was beaten far more than he shut opponents down. Peterson ended the season having given up 869 yards and allowing almost 60% of targets to be complete, but he did have games where he looked legit. The Cardinals put him on Dez Bryant for most of the Dallas game and he limited Bryant to seven catches for 76 yards and a touchdown, which doesn't sound like a great day, but he also broke up three more passes intended for Bryant and made some impressive plays. The following week he shut down Michael Crabtree before holding A.J. Green without a reception (in his coverage) two weeks after that. Peterson has elite athleticism and did show ability at the tail end of the season, but he has a long way to go to be mentioned alongside Revis.
I guess beauty is in the eye of the beholder. 7 catches for 76 yards and a TD isn't exactly "shut down" unless he was targeted upwards of 18-20 times.
Same for Crabtree, its hard to talk up 7 receptions even if it only went for 70 yards, if those are the routes he ran and he was only targeted 10 or so times then I'd say Crabtree still got the better of them. Unless someone can show me Crabs was targeted 15+ times that game I find it hard to believe PP is "elite".