The Rangers would have had to send five of their top young players to Kansas City to obtain Zack Greinke, according to Jon Heyman of SI.com (on Twitter). The Royals were asking for Tommy Hunter, Derek Holland, Michael Kirkman, Jurickson Profar and Engel Beltre.
Holland posted a 4.08 ERA with 8.5 K/9 and 3.8 BB/9 last year in his age-23 season, Hunter posted a 3.73 ERA in 128 innings in 2010 and is under team control for five more years and Profar, Beltre and Kirkman ranked 2nd, 5th and 6th, respectively, on Baseball America's preseason list of top Rangers prospects.
The Royals ultimately obtained Lorenzo Cain, Alcides Escobar, Jeremy Jeffress, and Jake Odorizzi from the Brewers for Greinke, Yuniesky Betancourt and $2MM. Now that Greinke has a cracked rib, the Rangers are probably glad they held onto their players.