Coach V, You've received excellent advice from TPM and TR of course!
I will share my son's story with you to simply illustrate the possibilities for a pitcher vs a position player. My son was a top CF defensively and offensively in our area in HS. His senior year, he returned to the mound pitching as a dual kid and attending two local showcases for pitching. Half the schools that recruited him actually did so for pitching! That wouldn't happen with a position player just beginning to play a position.... or it would be very rare! Pitchers are in very high demand and like has been said, if he can pitch, he'll have a place. Especially with the grades and size your son has!
Also, in college there are some coaches that want two way players, but most prefer pitchers only pitch in our experience. I've changed my tune a bit no this subject as I've come to realize how difficult it is to be both.... the time commitment is that of the pitchers and the position player! Very, very difficult and something will probably suffer. JMO