Green Bay Packers running back Josh Jacobs believes he has a chip on his shoulder, according to running backs coach Ben Sirmans. "I think he's coming in with a little bit of a chip on his shoulder because we all have something to prove," Sirmans told the media on Wednesday. "I think he wants to prove we made the right decision in investing in him." Jacobs doesn't necessarily have a whole lot more to prove after tallying 3,154 scrimmage yards and 18 touchdowns over his final two seasons with the...