You said "The numbers on the 1098-T don't correspond at all and don't account for all of the money the VA via the post-9/11 GI Bill paid to the school for tuition and fees".
KrisD15 replied "VA funds are never taxable"
That is, the post 9/11 GI Bill benefits are not treated as scholarships. They are totally tax free benefits and are taken into account in the calculations. Treat that money the same as if it came out of your son's bank account.
