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Jennings is off to a phenomenal start to the 2012 season, leading the league in both interceptions (four) and pass deflections (nine).
Had the 49ers signed Jennings, they would have had arguably the best cornerback trio in the league with Carlos Rogers and Tarell Brown.
And with the talented Bears cornerback, the 49ers could have tried experimenting with Chris Culliver as a safety, a position he played in college.
Donte Whitner is an incredible run-stuffer, but his coverage skills were once again exposed against Minnesota. He dropped what should have been an easy interception for a touchdown, and he allowed Kyle Rudolph to catch a high-arching pass by Christian Ponder for a touchdown in the fourth quarter. Whitner had plenty of time to turn his head and make a play on the ball, but instead he face-guarded Rudolph.
With Jennings, the 49ers would have had the option to have Culliver, an impressive cornerback in his own right, sub in for Whitner and play safety on passing downs, potentially making the 49ers pass defense more formidable.
Jennings signed a two-year, $6.6 million deal this offseason, a bargain for a guy with his ability.