I'm a Steelers fan but I have nothing against the Giants. Some history followed by an unscientific calculation ....
(1) September, 2000 - January,2005: Plaxico Burress plays for the Pittsburgh Steelers and leaves as a free agent. Why? The Steelers chose to keep Hines Ward, the #2 WR on the depth chart, who consistently outperformed Burress (the supposedly #1 WR on the depth chart).
(2) September, 2005: Burress starts for the NY Giants.
(3) February, 2006: Pittsburgh Steelers win Super Bowl XL.
(4) 2007 season: Burress wins Super Bowl with the NY Giants. Gets lucky when Eli Manning achieves the scramble of a lifetime on a busted play and manages to toss the ball to Burress (who, I hate to admit it, did make a good catch).
(5) 2008: In nine games, Burress scores only 3 TD's, gains only 454 yards, and (to date) misses 3 entire games while the Giants win all 3 of those games and have a YTD record of 11-1.
Add #3 and #5 together and what do you get? Teams do not need Plaxico Burress to win. Good riddens.