I was fussing with some fools about this earlier...
Richard Sherman only has to play 1 side of the field while PP is shadowing every teams #1 receiver on every offensive play (megatron, jimmy grahm, julio, etc). Sherman has Earl *fucking* Thomas (all pro FS) over the top on damn near every play which allows him to gamble because he knows that Earl Thomas is money in both run and pass plays and nothing will get past him. Team will shift their formations to ensure their #1 isnt on Sherman side of the field.