I'm not criticizing you for saying that, I think it's a logical train of thought.
I personally still disagree with it. I've said before that although his actions and words seem baffling to many people I don't think they suggest any complicity in the actual crime, nor knowledge of the cover-up. I do believe he truly wanted to find Lucas, and maybe he did con himself (with the help of others) that Lucas might still be alive.
In the NG yesterday JH talked about his dreams being disturbing at this time, and the one he chose to share was one about searching for Lucas in his dreams. I think that's a strong sign that for all these months he has really felt the pain of Lucas being missing, and *missing* is how he's perceived it. I don't think these dreams would be consistent with him having knowledge of EG hiding the body.
If he did have anything to do with causing Lucas to die, I don't think either he or EG were aware of that. By the time EG was talking to DM and talking about this alleged concussion, if that had been caused by JH that would have been a perfect opportunity to throw him under the bus, but she chose not to and instead used words that implied she was the only one with fault.
I also remember some of the things JO said in her radio interview, and JH's words and behavior seem very consistent with the things JO said about him. Then there's what DM said to EG on the tapes when he said something about EG not wanting to open up in front of JH out of fear of JH's response. And DM said that in his opinion he thought she was afraid for no reason and he didn't think JH would do anything. I think JH is showing us that DM is probably quite right...even after he was angry about the Olive Garden, disgusted and angry about her hiding Lucas' body, all that he's done is to calm down to the point where he'll allow her in the house, text with her, talk with her, and try to get her to open up more about what exactly did transpire before she dumped the body, because he needed to know how his son died and exactly what part she had in it, despite his head not wanting to go there of its own accord, I think he still needed to know.
I agree his responses are baffling, and maybe only 1% of people would react the way he does to things, and we as humans are trained to see these anomalies as suspicious, we look for anomalies like this to try to ascertain guilt. But I don't think they're inconsistent with his inner nature, and I still can't see anything that shouts to me that he was complicit in the actual crime or that he had knowledge after the fact. I have been looking for signs of those things, but I can't see them.