It will always be very confusing for newcomers to the wonders of the ASD world if everyone expresses all of the observations of ASD behavior as separate conditions. Nature has little reverence for the learned individuals who have described these behaviors over the years and we should not view them as distinct “illnesses”. The labels that are presented are nothing more than a convenient mechanism for describing SOME of the features of an ASD individual. Their actual neurological make-up may very well share lots of aspects of what are sometimes labeled as separate entries in some medical classification system.
Developmentally it makes perfect sense for some individuals to come along with a more (or less) observable external presentation of their core differences at major neurological milestones in their life which may affect the way they interact with their environment. The events known as “Neural Pruning” re-wires the brain at different stages in life and various behavioral changes are seen, even in “NT” brain – as the child moves out of babyhood, into and out of the teenage years and perhaps even the “mid-life crisis”.
So to my mind the point of diagnosis may very well mirror these massive periods of change in the brain – any or all of them!
As to ADHD vs Aspergers: it’s not surprising that it is difficult to differentiate when they almost certainly are simply different presentations of the same neurological differences – as with all ASD.