Asynchrony is a description, not a diagnosis. It describes these kids with intense internal drives to understand more, do more, know more, and how they interact with the world around them.
Asynchrony is, in a nutshell, development outside of the expected developmental window. It’s usually a combination of really early and really late at the same time.
It means, in our case,
early reading but late collaborative play
early math but late physical coordination
early awareness of people’s emotions but late development of the maturity to deal with said emotions
early interest in and understanding of the world coupled with late development of the social skills that ease peer interactions