Why trade something of value for Josh Willingham when the Reds already have his clone in Ryan Ludwick? According to baseball-reference.com, the most similar player to Willingham is Ludwick, and the third-most similar player to Ludwick is Willingham.
By age, Ludwick was the tenth-most similar player to Willingham at age 29, the fourth-most-similar at age 30, the most similar at age 31, and the second-most similar at age 32.
Willingham was the third-most similar player to Ludwick at age 29, the second-most similar at age 30, the most similar at age 31, and the fourth-most similar at age 32.
Both players are 33 this season.