Check out this assessment from Bucky Brooks (NFL Network, former pro) in his comparison of Peterson to Rickard Sherman:
Tackling
You must be registered for see images attach
While tackling is not viewed as a priority by most cornerbacks, elite defenders understand the importance of being a factor against the run. Peterson, however, is best described as a reluctant tackler on the perimeter. He will throw his body around and make contact with runners on the corner, but he isn't the aggressive tackler that his impressive physical dimensions would suggest.
Sherman is an impactful hitter on the edges. Although he prefers to hit big runners at the knees, there is no questioning the toughness or physicality he shows on tape. Sherman appears to relish the opportunity to make hits on unsuspecting runners and receivers in space. Additionally, he shows a willingness to hit ball carriers squarely, despite his slender frame.
Tackling is considered a lost art in pro football. The fact that Sherman is a willing tackler makes him a welcome asset in the back end.
Advantage: Sherman