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Antoine Winfield — B+
Shockingly the only player who was effective against Brandon Marshall, Winfield wasn't exposed too often. While his signature is his ability to tackle—and he finished with seven—more important was that Cutler chose not to test Winfield's coverage. Finishing with an interception and a pass deflection, Winfield's only big blemish was a missed tackle on Marshall.
A.J. Jefferson — F
Right after a pretty OK game against the league's most prolific passing offense, Jefferson looked to have proved himself. While still probably worth the conditional pick the Vikings, Jefferson replaced Robinson as the defensive goat. With missed tackles, poor leverage and the tendency to drift out of zones, Jefferson was the biggest weakness the Vikings had on defense.
Josh Robinson — C+
Neither terrible nor extraordinary, Robinson wasn't targeted too often and therefore wasn't really consequential. While Earl Bennett was able to do some damage against the Vikings, it's clear that Robinson learned a lesson from his game against Calvin Johnson.
Harrison Smith — B
Smith flew across the field, finishing with six tackles. His coverage skills were generally good, but he does benefit from a drop in the end zone. The Bears only targeted deep all day, a testament to his coverage, but Smith mostly benefits from the fact that his intuition allowed him to make plays across the field.
Mistral Raymond — C+
Raymond still doesn't look to be a better safety than Sanford, but seems more sure of himself than he was a week ago. Despite his heavy rotation, he only recorded on tackle—and a critical one—but wasn't really a factor otherwise. His near fumble recovery for a touchdown was a heads up play, and he deserves some credit for it.
Jamarca Sanford — B-
Sanford was the quintessential strong safety, rushing the passer, cheating into the box and taking on man coverage assignments. With 4 tackles, he did have an impact on the game, but his coverage was better than his (normally phenomenal) run support. A quarterback hit was a nice cherry to add on top of a solid performance.