When my son was five and in kindergarten he too was very articulate, was interested in a lot of different things and loved to talk about his interests to older friends and adults because kids his age did not understand what he was talking about and did not get the jokes that he made or understand the high level words that he used in his speech. When he was about nine I remember hearing a girl his age in musical theater class telling her friend that he was speaking in some geeky language that only geeks understand. Only his older friends (three and four years older) really seemed to enjoy talking to him. They had no trouble understanding him. They loved his sense of humor, his knowledge of technology and his knowledge of video games. They were the ones that invited him to birthday parties and to spend the night at their houses, not the kids his age.
Some teachers in our small town public school thought he must have asperger's because he read at a 5th grade level or maybe even higher before he started kindergarten and he could do mental math including some multiplication. What he couldn't well was physical things like coloring in the lines. We told the kindergarten teacher he had hypotonia and some sensory issues but I think she thought it was more evidence of asperger's. He did not really have behavior issues except when he was told to do a lot of coloring in the lines. He was supposed to color "letter people" and he got so sick of coloring that he would scribble. Scribbling instead of coloring in the lines was his only act of defiance. I think there might have been more acts of defiance if he had been in school all day instead of a half day and not allowed to learn at his level. He would come home after he got out of school and learn new things online.
Not one doctor has ever suggested that he had asperger's and he has been to a lot of them because of physical issues.
