Hard for me to say a 29 year old has huge upside as anything. He strikes out a lot of dudes, walks a lot of dudes and gives up a lot of homers. He's maybe a middle relief type guy. FWIW, he had a lot of buzz coming into this season. The stats back it up, Steamer for example has a rest-of-season projection of 3.01 ERA, 3.10 FIP, 13.3 K/9. Don't just look at his ERA in 25 career innings. He's been walking everybody and giving up homers on top of that in AAA which has led to a 5+ ERA. Forgive me if I find it unlikely that he posts a 3 ERA in the majors.