Dichotomous logic is always a fallacy. Still statistical probabilities hold analytical value.
So if neuro normative is center, and Autism is a spectrum of a divergent branch, what branch or branches are most opposite Autism, sharing the least number of related traits?
Sure it does. There are traits that are of another polarity like, a lack of ethics, narcissism, bipolar, multiple personalities, or megalomania. If most autistic people are introverted, the opposite will be mostly extroverted in disorder.
For every force there is an opposite equilibrium in nature.
Usually, it is not the case that all the other cars on the highway are not going the wrong way.
No one builds freeways in one direction. The center divider is neutral but cars go both ways
One way roads and split highways exist, but even on any typical divided road, you obviously can still drive the wrong way. Either way, you’re conpletely missing the point. That phrase is used as a way of saying that if literally everyone else disagrees with you, then it’s a lot more likely that you’re the one who is wrong.
In this case, autism really doesn’t have an “opposite”. neurodevelopment is incredibly complex, and while some aspect exist on a spectrum, others don’t. (and the traits or development patterns that do exist on a spectrum in this case exist mostly between autistic and allistic traits, not between autism and some “opposite” pattern.
And the other traits you mentioned exist on their own orthoganal axes.