If he’s maxed out the merit, I’d be careful. Financial need is reassessed every year and therefore financial aid can be readjusted from year to year. You might be enticed by a good number for freshman year but then find yourself back in the same boat for sophomore year but with a kid whose now through their first year of college and committed to that school. Unless the money is guaranteed for 4 years, things can get dicey.
Beware the bait and switch.