The campus visit buys you time. Go prepared for how he’s going to respond when they go for the close. Time will give you a better idea of where he stands in the overall process. But he doesn’t want to respond in a fashion where they start to feel like they’re the safety school option.
Regardless of what a school offers the scholarship money is finite. If left the feeling your son isn’t really up for going there they will start offering elsewhere. Then your son could make up his mind and the money is gone.