The Bears knew they had quite the headache to contend with in their running back conundrum this off-season. A migraine would probably be more accurate. Trading Jordan Howard, drafting David Montgomery, and signing Mike Davis was an emblem of leadership at Halas Hall recognizing Chicago’s backfield drink had to be shaken and stirred. (Sorry, James Bond.) A reasonable expectation for this newfangled backfield trio of Montgomery, Davis, and Tarik Cohen is them helping to evolve the Bears offense. They can start by dramatically lifting and shifting one specific rushing aspect alone.