He already has plus feel for his change-up - in the Carolina League it is a deadly pitch. Even with his lower velo, batters just rarely seem to get a drop on anything he's throwing. I would say, tho, that everything hinges on that change-up. He'll throw it any count.
I don't know what Manuel Rodriguez and Melvin Hernandez peaks look like at this juncture. This is why I have my deeper thoughts on the two waiting until they reach the Southern League. As it currently stands at their respective levels, however, all they seem to do is pitch highly efficient, meaningfully productive, low-scoring outings. It truly is incredible to watch. But, then again, at this point in time almost all of the Brewers youngest pitchers are doing that. It's uncanny.