A very tough decision, and still not sure if he made the right one, but University of Michigan it is! He’s looking forward to studying with Prof. Green.
Thanks again to everyone for your thoughtful advice!
It’s a great choice @Violet4. Congratulations! And now that the decision is made, you and your son should not look back. There were no wrong choices here, so embrace the one he’s made and only look forward. And come back now and again to tell us how he’s doing. 
Will do @jazzpianodad! Thanks again for taking the time to respond to my post. I appreciate the supportive environment here on the music threads; it’s a great community.