I have gotten two separate reports this year that have Stewart sitting 92-95 all game and hitting 96 MPH multiple times during the game. I saw his slider this year in Dayton. Its a plus pitch. Previous scouting reports back that up as well. His change up is in the 86-88 MPH range. When its on, its a good pitch.
I can't bust out the OFP report on him because well, I don't have one. I do know what I have been told though and what I have seen with my eyes.