The expectation was that Duffey would make just a spot start as Ervin Santana battled early - season back issues .
Ervin Santana ended up missing 16 games , and as a result Duffey settled into that spot in the rotation .
The expectation was that Duffey would make just a spot start as Ervin Santana battled early - season back issues , but Santana ended up missing 16 games , and as a result Duffey settled into that spot in the rotation .