That's not "only", that's the whole point. That's a flawed point. Zambrano relieved in the minors, had control questions, and hadn't shown a 3rd pitch of merit, but became a very valuable starter. Dempster had relieved, had control questions, and hadn't shown a 3rd pitch in 5 or 6 years, but became a very valuable starter. Cashner has started in the pros, has shown a 3rd pitch, and has shown improving control. (His control compares reasonably with most rotation prospects of his age and experience.) So if you had "reliever" written all over him when he was drafted, mightn't it be reasonable to erase that now? Unless you'd prefer to use your good pitchers as 60-inning relievers rather than 180+ inning starters? zambrano relieved in the minors because the cubs' bullpen sucked and they were looking for immediate help. he always threw hard and maintained his velocity well into ballgames. he wasn't a reliever in the minors because they thought he couldn't cut it as a starter.