BOSTON -- While their pursuit of free agents Carl Crawford and Jayson Werth has grabbed most of the attention, Red Sox general manager Theo Epstein has quietly been laying the groundwork for what could be the team's biggest offensive acquisition since Manny Ramirez.Epstein has been engaged in ongoing discussions with his former top lieutenant, San Diego Padres general manager Jed Hoyer, about a trade that would bring slugging first baseman Adrian Gonzalez to Boston. It appears Epstein is making some he