As of right now, the Diamondbacks have 4 established starters: Ian Kennedy, Daniel Hudson, Trevor Cahill, and Josh Collmentor. They're known to be pursuing Joe Saunders and Hiroki Kuroda both who would cost several million to sign. The question do we need either these guys?
The Diamondbacks have 4 major league ready prospects: Trevor Bauer, Tyler Skaggs, Patrick Corbin, and Wade Miley. Three of the 4 are left-handed. But all four are making approximately the league minimum which could save us money if we need to take some on during a trade. The Braves seemed to have success using Brandon Beachy in their fifth starter spot. (Their offense ran dry so you can't use the failure to get to the postseason as an argument)