The piece is lacking, IMO, in that it does not provide any context for Granderson's stats. The simple fact is that he has been a terrible hitter with men on base, while being competent with the bases empty. While he cannot control how his teammates perform, if he hit better with men on base then he would have more RBI.
Bases empty: .248 AVG / .342 OBP / .524 SLG / .866 OPS - quite good
Men on: .204 AVG / .311 OBP / .344 SLG / .655 OPS - awful
He has 401 PA with the bases empty and 222 with men on. He has hit 24 HR with the bases empty and 6 with men on. So he has had 55% as many PA with men on as with the bases empty, but only 25% as many HR.
But because of his position in the lineup – batting leadoff, and rarely having teammates on base due to the game situation or to teammate failure – Granderson may set a mark no player will endeavor to break
Nowhere in the article does it blame Granderson, which is a flaw in the article IMO.