I'm a Cardinals fan who watches all of their games & I agree with you. I wouldn't go as far as saying Peterson is overrated, but what you said is true. With that said, he did have a great season last year & didn't get burned as much. He's been a lot better at staying disciplined & not going for the big interception all the time. He held AJ Green & Antonio Brown to 2 catches! He definitely belongs in the top 5.
Josh Norman absolutely earned the top spot last year. No way is he a system guy. Richard Sherman is more of a system guy than Norman. The Seahawks play a cover 3 virtually the entire game giving Sherman backside help from 2 of the best safeties in the game. That said, Sherman does hold his own & should be a little higher.