It's difficult to make an assessment about someone from a few brief comments made under the stress of a polygraph and a gruesome death scene. It's best to have a complete picture of someone's functioning when making assessments about their interpersonal interactions, language, syntax, etc.
Having said this, I (and many others) agree that at a minimum, AS's public statements and polygraph interactions are quite odd-- EVEN in the face of such a stressful situation. I have personally wondered if AS has some type of emotional/ behavioral disability (high functioning) such as being on the autism spectrum. I wonder how large the crew is on his tugboat job, and how much he has to interact in that environment. He may have gravitated to a type of job where he doesn't have to have much interaction with others, due to his odd personality and interactive habits. Just speculation.
All of his comments, including the blunt admission about his masturbation activities, and the comments to LE about his "bedside manner", demonstrate a rather flat, socially inappropriate, and disconnected pattern of interaction, IMO. His syntax is peculiar. He may communicate more appropriately in less stressful situations, and deteriorate to this flat and disconnected inappropriate pattern under stress. I personally cannot attribute this odd pattern of interaction to Ambien use.
One of the things that nags at me when I think of AS and something like the possibility high functioning autism, or some other Axis II disorder, is the potential for someone like this to be manipulated by others. Even very odd people can be "vulnerable adults". And when I think of Dina's and Jonah's involvement and interest with the autism population and therapy programs, I wonder if AS fits into that interest somewhere. It also would make sense to me why Jonah immediately kicked into "protect Adam" mode the day of Rebecca's death, when he urgently called Paul Pfingst. PP essentially dropped whatever he was doing to attend to Jonah's request to vigorously protect Adam from questioning, and PP even showed up at the death scene inside the crime tape- many hours before the ME arrived. (Huge conflict of interest, IMO.) Jonah didn't hire PP to protect himself-- he hired PP for Adam's interests. That speaks volumes to me about what Jonah's concerns were that day. And I think Jonah did not answer that strange text from Adam on purpose-- Jonah knew how odd it was to get a text like that, IMO.
IMO, Adam could be vulnerable to being manipulated by someone with Dina's background in social skills training for people with autism. Jonah may have suspected this as well. Particularly in a crisis or emergency situation, or a murder.
And AS has always seemed to be very "scripted" when he has been discussing Rebecca's hanging-- he is very vague and wishy washy about EVERYTHING except his "certainty" that Rebecca "hung herself". That alone is VERY odd and suspicious, IMO. From the very first 911 call, he is the one who started the "hung herself" narrative.
Adam has never sought out the media. He has been pretty much entirely silent since Rebecca's death. He had no ax to grind with Rebecca. But Dina most certainly did. IMO.