It’s difficult to consistently keep their sinkers down in the zone. If that trickles up an inch or 2, that pitch is ending up in the 3rd deck. I still have nightmares about Carlos Silva. He was able to keep his sinker down during the 2005 season and had a career season. The very next season he couldn’t locate his sinker and his ERA ballooned to 5.94. As you said, not having an out pitch is the big concern. Without that, Dobnak is walking a tight rope every time he pitches.