He throws super hard and has a violent delivery, with poor command. There's no guarantee he'll stay healthy long enough to even make it to the Twins (see, e.g., JT Chargois) or do much once he's there. That's my problem with it - there's limited upside due to his relief role, yet still a good amount of risk. It's not necessarily a bad bet purely in WAR terms, but it's a missed opportunity to add depth at a more important position.