Is higher intelligence assosciated with SPD?

I am a preschool teacher. I have worked with children that have had SPD and different types of autism. This is not my speciality, but I have done training on these disorders and I can usually spot these differences.

I have a child this year, that may have one or both together, yet his symptoms vary and follow under traits of both ASD and SPD. The parents are not both on board and have been told by two schools and teachers that their child has Autism. I am not sure I agree. I see more SPD traits then any autism. This child's language is so advanced and since 18mos could read. He mainly has conversations with me and his parents, but not much with his peers. If I guide him, he will use his words correctly to speak to his friends.

However sometimes he says he can't or its nothing. My student can do anything the others do, some guided, some not....at this point I know he needs to be evaluated, but not sure if I can get both parents on board. I have made progress with this child and I want to see it continue. If this child has ASD, it is mild and the sensory issues are the greater problem. The only thing that baffles me is his language development. it seems like a classic Aspergers case, but he does not fall under the norm, even for that. Can a child read and have a higher IQ with the SPD????