Wow. Does this bring back memories.
Not that I am an expert but for a freshman he seems very balanced & undercontrol with nice arm action. I doubt he is throwing his hardest in the video but as he develops core strength, he has the mechanics in place that will help develop more speed and he will be able to easily repeat his delivery (good command).
I completely agree with PG. I don't not think I would tinker much. Work on getting stronger & always protect the arm! Thanks for sharing.