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You invest your starting RF into a #3-4 starter, and the guy goes nominally INTO your rotation ... well, if three kids blow the league away, it wasn't your fault in dealing for him. So much the better if rookies leave you no choice.
It's "amateurish" to write Taijuan and Hultzen into a Sonny Gray-type 2015, even if you suspect it, but you're not averse to it occurring.
Can't disagree with you there either :- )