That makes me think he doesn't have ADHD at all - and just needs more challenge.
It sounds that way to me too....... if he is not doing the seat dance* when challenged, then I would say no he doesn't have it.
* the head and maybe one hand stay with the work while the rest of the body snakes around in the chair..... feet will sometimes reach head high..... that is what I see when my DS7 works on something, or eats a meal, etc.
Mis-diagnosis is terrible. I had a speech therapist last year decide my son had Aspergars and did a test she wasn't qualified to administer to prove it. I've now had three Doctors all agree that he doesn't have it.