Heyward was dealt a year from free agency for a package that included one young established major league starter — Shelby Miller — plus touted prospect Tyrell Jenkins. Heyward had been worth 21.6 wins above replacement (a stat known as WAR that shows how much better a player is than his potential replacement) through his age-24 season, according to FanGraphs, with much of his value tied up in his elite defense.