No one here has answered your question about scholarship chances. The Common Data Set doesn’t address that at all.
Here’s an easy solution: Your son should call the admissions office, and ask them. He should say something like,i, “You’re on my list to make an application, but I’m not planning to visit anywhere until I have an acceptance and a financial offer that’s affordable. I don’t want to fall in love with a college I can’t afford, and I don’t want to ask my mom to drive all weekend for something I don’t know will be a real option. But if there’s any chance that coming to this program will give me a leg up on a merit scholarship at your college, I don’t want to miss that opportunity! It’s a great school, and I would love it if things worked out there. So tell me, will coming give me any advantage for additional scholarships?”
He will get an honest answer. And whatever the outcome, the call will likely get noted, and can’t possibly hurt him.