Based on your post, I see your son as a hitter (position player) who can throw a few innings. Batting 4th on a good travel team and pitching velocity led to my conclusion. What do you see as his chief tools? What position(s) does he play in HS? If catching is a passion (and it needs to be), what is his pop time (I key recruiting metric for the position)? That needs to be decided. His hitting likewise will carry his recruitment- don't lose the versatility.
Many showcases allow the player to "showcase" himself at two positions. For my son, it was MI and CF. He would bring both mitts. A strong armed 3b, should also be able to playing corner OF too (especially as you have indicated your son's athleticism). If at some point schools are targeting his catcher aptitude and skills, he can forget about pitching. I don't know what kind of schools/conferences your son is vetting. The schools who have smaller recruiting classes value versatility (or generalist as you write). Good luck.