QUARTERBACKS The assignment: Shaun Hill was supposed to manage an offense driven by a powerful running game. When that running game failed, Hill was replaced by Alex Smith, who coaches believe can better open up the offense in the absence of a strong ground game. Progress report: Smith has shown flashes of being the quarterback everyone expected him to become. But Sunday's loss to Tennessee also showed that he is capable of lapsing into the mistake-prone quarterback who mostly has frust...