The problem with counting on the IL Red Sox to return and contribute at their past levels are that Story, Duvall and Mondesi are all out with injuries that will most likely have severe affects on their strengths -- or in Story's case, the shortstop position he was supposed to play at an elite level.
Story's throwing elbow, Mondesi's knee, Duvall's wrist... Does it really make sense to expect Story to return to a spot he hasn't played in two years and gun people out from deep in the hole? Does it make any sense to think Mondesi will be as fast, even after healing from blowing out his knee, because of inevitable scar tissue? Will Duvall really be back at his full power-swinging strength, a few months after traumatizing half the arms that whip the bat?