Not sure, based on your description he should only be pitching. 6.55 and a strong arm are two tools that really stand out. Also, FWIW, power arms often develop into power hitters.
There is a 2016 by the name of Josh Lowe who we selected for our All American Game. He is a tall (6'4") RHP and throws in the mid 90s with a good breaking ball and change up. At the same time he is the #1 tools guy in his class. Plus runner, Plus Arm, Plus Field, Plus hitter, Plus Power.
He would be a first round pitcher, still might be, but we think a MLB club will draft him very early as a position player. We are very happy that no one turned him into a pitcher only.
He is just one of many examples.
Based on size, athleticism, and the two already obvious tools your son possesses, I think it would be wise to have him play a position. Zack Greinke was mostly a position player in his younger years and just pitched some. He was still drafted as a pitcher.
Guess I don't believe in kids that have plus tools becoming pitchers only, unless they are among the very best pitchers in the country.
Thanks for your input. I was not in agreement to have him play for them as a PO. I should have told them no thank you. But it was his decision and he was ok with it. He justified the situation thinking he will get plenty of position play in the spring and summer high school season. I guess they didn't see enough out his bat during the 8 or so flips in the cage, or they felt they had enough outfielders. Sending you a PM.