Just caught this thread and wanted to chime in.
Dropping down a level is not a bad thing, if he's getting a lot of playing time. Dominating at a lower level is huge for confidence.
He's going to be working with a bunch of freshly graduated squirts? Sounds like a great opportunity for him to become a leader in the locker room and on the ice - a key skill that will help him in as he becomes a young adult.
Not having to see him play, it sounds like there's a great opportunity here for him to work with a private coach and eliminate bad habits/reinforce good ones.
As a kid that did goalie lessons once a week, I loved working with my goalie coach, but I was reinforcing the lessons with team practices and games.
Just curious, how close are you to NJ? I've got a buddy who's running lessons out there with a good background that I can link you up with.