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Michael Bush has long been more of a complementary back than a prime running back throughout his career. With the Oakland Raiders, Bush was often paired with Darren McFadden, and thrived in his role as the rolling thunder to McFadden's lightning, being a bruising back that defenders were afraid to bring down.
But once he got the chance, Bush would bolt to the greener pastures of Chicago, where he finds himself filling the same role, but only more effectively, alongside Matt Forte.
Bush has rushed for 242 yards on 64 carries, and is sharing the load with Forte in the Bears backfield. Considering Forte's injury history, Bush's signing was an important one for Chicago, who find themselves now teeming with options in the backfield.
Putting Bush in at the same time as Forte has caused headaches, but even when Bush is the lone running back, he has punished opponents at the line of scrimmage and averaged 3.8 yards per carry. His biggest responsibility has been as Chicago's third down back as well as their ball-control back, putting the game away by moving the ball forward and letting the time slip away.
The Bears are a true contender, and adding Bush to fill in at times for Forte is a major reason for that. While it didn't make as much headlines as the Brandon Marshall trade, Bush has been Chicago's best free agent acquisition of 2012.