Yes, you don't NEED a running game to be successful. But your just a much better offense when you have someone that can run the ball and you can mix up. Right now the Packers run game is so pathetic that handing it off is just a waste of a down because you know it's going to be a 1 yard gain. At least when Grant was back there there was always a chance. Now yes, with anybody back there there is a chance, but so far Jackson/Kuhn have proven to just be completely ineffective. If the running game doesn't take off against the Lions, some adjustments HAVE to be made.