It appears as though the Astros helped him to make some tweaks which directly led to improved results. I heard that he picked up a two seamer with the Astros which was a difference maker for him. He dropped his walk rate and increased his k rate a bunch during his time in Houston, so if those improvements carry forward he could be a real asset out of the pen. It's a bit of a gamble obviously but his salary isn't nearly large enough to really have any concerns in my view, and there with the premium stuff that he features there is potential for more.