

Thanks for the additional detail here! I knew I was making a broad generalization with “ground up” and don’t mean to imply that if you start with details (ground) you never make it to the big picture. As you said, more data and examples are necessary and while the overarching structure can eventually be seen, autistics are less like to wave away outliers as quickly as neurotypicals.
Still, I think it’s been well documented that in general autistics much more likely to utilize inductive reasoning whereas neurotypicals rely more on deductive reasoning. Both have strengths and downsides and work best in combination.
It’s almost as if we need each other and should cherish the differences that make us better together! In my experience, that means NTs need to adjust more to autistics because autistic people are constantly adjusting to a society that overvalues NTs.

It’s really great that you’re seeking help and talking openly about this! Encopresis is too often shameful and kids suffer when parents don’t speak up.
There’s lots of conflicting advice out there and I strongly recommend you find pediatric autism specialist if as all possible. A generalist MD or therapist is not likely to be knowledgable about this topic.
This website, despite the sales pitch, has good information and a detailed manual. It might be worth reading. https://www.encopresis.com/encopresis-manual/
Editing to add that interoception may be part of the issue. People with ASD often have more distant perceptions of internal bodily sensations than allistics, so your son may only perceive his need to defecate at a 1/10 where another kid might feel it at a 7/10. Teaching body check ins and mindfulness can be helpful, but is tricky with young kids.