If Aaron Sanchez isn't a lights out reliever, then I don't know who is. Over the past 2 years, he is 5th in ERA behind Davis, Betances, Giles, and O'Day with a 1.67 mark. Opponents have hit a paltry .149 against him, beaten only by Wade Davis. He has walked only 2.43/9 and is also top 5 in groundballs at 66.7%.
I support using him as a starter, but get your facts straight.