The Rockies enjoyed an active offseason, adding $33 million in contracts with reinforcements at first base, the pitching rotation and the bullpen. Players already in the organization, however, could play just as important a role in shaping a season the Rockies hope sends them back the playoffs for the first time since 2009.

Pitchers Jonathan Gray and Eddie Butler represent the future. By any measure, they are among the top 50 prospects in baseball, and top 20 when discussing Gray's potential. They own the ability to front a rotation if they continue on their current trajectory. Their path to the big leagues was accelerated last summer, and they will continue on the fast track this spring.

As expected, both received nonroster invitations to the major-league camp in spring training, an honor that hints of their potential and how close the two right-handed fireballers are to the majors.