JuCo --- not sure what the rules are but where I'm at they practice, scrimmage, workout and play games all the time..... so I think he could develop in JuCo. But if you are not ready to play, you will not play at JuCo... most of the time I see the ones that are playing are D1 and D2 talent that maybe slipped through the cracks, or had grade issues trying to get back to D1 , D2 or get drafted.
You could try JuCo and always transfer to D3..... after one or two years.... JuCo class work is not as demanding as D3.... The D3's I know do not practice as much as JuCo due to school.
As others have said, whats first on the list baseball or school? Good luck it will work out. Not the end of the world.