From https://www.skornorth.com/twins-2/2019/07/two-years-after-going-undrafted-twins-prospect-randy-dobnak-may-be-nearing-big-league-callup/ he has a 92-93 MPH 1 seam sinker that is 92-93 but not a high spin rate. He can touch 96. The question becomes how much movement does he get on it. If he gets good movement he will be effective as a ground ball pitcher. If not, well, the cup of coffee tasted great. If the coaching can add a couple miles to the pitch, he becomes an effective pitcher.