Thanks so much for all of the great information. To add a little more detail, he has gone through full psych testing twice in the last 7-8 years and does not have ADD/ADHD. I did neglect to mention one other thing though, he has a minor processing disorder. I do not think he takes advantage of possible accommodations for that (though ACT would somewhat suggest he doesn’t really need them), and unfortunately it does not appear that’s considered a SLD that would qualify him for something like the Marshall center you linked.
Regarding ME, we’ve read all the threads on here with the AE vs ME debates and he’s really wanting AE, though would consider ME with Aero concentration if by chance there’s an opportunity to swim at a D2/D3 school with that degree option. Right now that possibility does not exist, but there’s at least been some contact from coaches from a couple of them (Rose Hulman for example).
Arizona is actually on the list too, I just didn’t want to list every possible school in my original post 
Great to know about it’s SALT center being so highly thought of.
Again, thank you for all the great information and taking the time to respond.