http://www.fangraphs.com/leaders.aspx?pos=all&stats=bat&lg=all&qual=0&type=8&season=2013&month=0&season1=&ind=0&team=3&players=0
http://www.fangraphs.com/leaders.aspx?pos=all&stats=pit&lg=all&qual=0&type=8&season=2013&month=0&season1=2013&ind=0&team=3&rost=0&age=0&filter=&players=0
Those are the 2013 Red Sox.
http://www.fangraphs.com/leaders.aspx?pos=all&stats=pit&lg=all&qual=0&type=8&season=2013&month=0&season1=2013&ind=0&team=3&rost=0&age=0&filter=&players=0
http://www.fangraphs.com/leaders.aspx?pos=all&stats=pit&lg=all&qual=0&type=8&season=2013&month=0&season1=2013&ind=0&team=3&rost=0&age=0&filter=&players=0
Those are the 2012 Red Sox.
The Red Sox added Napoli, Victorino, Dempster, Ross, got a rebound from Lester, got contributions from guys like Workman, Britton and Webster, traded for Peavy, Thornton, etc. They played under their pytho in 2012 and got not only added key free agents, they also had rebound years and progression.
They're on pace for ~52 fWAR this year. They had 30.9 last year.
Now let me ask you. Do you think John Farrell is responsible for a 20 fWAR improvement?