Congratulations on the great aid your son is receiving!
One additional item to consider. Some outside scholarships are dependent on not reducing other aid. One of the scholarships D18 has requires annual verification from the school that other aid is not being reduced due to the scholarship.
D18’s school allows her outside scholarships to take the place of loans and work study.
Hopefully you can defer some of the outside scholarships to take advantage of all of the aid.