During the Yankees' 4 World Series championships from 1996 to 2000, the player with the greatest WAR on the team was not a member of the Core Four, but actually Bernie Williams.
Ranking Yankees Legends With The Longest Tenures In New York
30 key figures to the Yankees' 1996 World Series title
Every World Series Champion Ranked - Baseball Egg
MORE
The Yankees' signing of El Duque made 1998 even more magical - Pinstripe Alley
Derek Jeter heading to Hall of Fame, although not unanimously
Captain cool as always, Jeter honored by Yankees
John Letasky: For a lifelong Yankees fan, visiting George M. Steinbrenner Field was like a dream
Mariano Rivera - Wikipedia
Yankees Jorge Posada: Bernie Williams was key to success of Core Four - Sports Illustrated NY Yankees News, Analysis and More
Yankees of the Decade: The best from 1991-00
The 8 most dominant Yankees teams of the last 25 years - The Athletic
The Yankee Years: Torre, Joe, Verducci, Tom: 9780767930420: : Books
Philadelphia's Best Team Ever? - WSJ
The best players to wear every jersey number in New York sports history - The Athletic