PT -- Just a thought for you and your ball player, but if has a little natural movement, trying different grips on a 2-finger, 2-seam, may give him more movement and options.
My Southpaw's (a 2011) 2-seamer has historically cut and sank into righties (obviously, falling away from lefties). This year, as he got a little stronger, his 2-seam started tailing hard away from righties (boring in on lefties). His 4-seam FB runs travels straight as an arrow.
Through small changes to his grip, and how he sets his hand in his glove, he is learning how to create a Cut or a Tail on command. Today, he isn't blowing the ball by guys; but he is very effective, because it is hard for hitters to square him up.
This could be a good time of year for your Pitcher to try a few new things, to see if it gives him some new weapons.
For what it's worth.