I personally don't believe much in IQ test showing intiligence. Honestly there are to much factors influencing it to make it reliable in my eyes.

As for the gap well i've spend some time on a forum with people who had autisme and yes a lot of them had that gap. But i don't think it having a gap means problems... It could indicate some but it's not a necesary thing i think...

but there are people in this world who probebly know much more about this then me