Panzer, they don't believe in DS's profile because they have never seen anything like him before. He is too rare. A teacher will encounter at most one like him (and more likely none)-- they just don't see this coming.
I'd say give this a little time, support the teachers and their work, support DS's learning to navigate the school setting, and see what the teachers are saying in a few weeks or months. Especially after they start introducing "numeracy concepts." It will be fun to watch as he reveals his powers.
