Arm Slot Question?

My 10 y.o. throws and pitches with his higher arm slot. What concerns me is that his forearm is over or on top of his head. I am reminded of the pitcher CJ Wilson. Is this ok or natural?

Unless he’s doing it purposefully, it’s natural to him.
My son’s arm slot changed several times over the years. Unless it’s something you think is going to injury him, I wouldn’t worry about it.
When he throws in the field, how does his arm slot compare?

Same in the field. He has been throwing that way all last fall. He has good speed. Just looks a little different. Just wondering if I should change it in Jan when we start back?