Biggest regret I have about my career is not going to a dealership to begin with, experienced guys to learn from, specialized training, and the opportunity to learn how to use the proper tools a lot of smaller shops don't have. If he's going to school for it most dealerships would provide the ability to start out and move up. Not to knock these guys who work in aftermarket shops but I always stuggled back then because i either didn't have someone to ask, couldn't get the right tool, didn't know what the right tool was, or they were too busy trying to make me a manager just because I had some mechanical ability.
Just my 2 cents, he can learn anywhere, I just think there is more to gain from a manufacturer.