when he was doing interview, he talked smoothly, but he stuttered a bit here and there. So, I guess that might be part of his ADD or ADHD, or whatever you are talking about. But a very mild case though. Compare to other that were being interviewed, they talked smoothly too but without the stuttering.
About his appearance, compare to his friends and other competitors, they look slightly brighter than he is. Like a normal average person. But who am i say too, i look a lot dumber than many people on average.