As always, balancing pros and cons.
On the one hand it is a shaky ground because most “weird” killers might have these traits. Dahmer, Keys, our school shooters. Even Oswald, MOO.
Not only this, strange interests and behaviors, like…interest in bodies? So it might be in “the murder suits him” area.
On the other hand, such people might indeed be manipulated by a group.
A tendency to make off-color jokes might be misunderstood by others. Or, OCD tendencies that bothered BK’s family when he got back…but could his family share the same traits and hence, lack the capacity to interpret the behavior in the correct way?
So I would have trouble knowing what to do with it. Could BK, a loner, probably frustrated but having no clue how to approach people, take it on the world, especially on women? For sure.
Could he be a “too convenient” scapegoat? Yes, he could.
A very tough case and a tough line of defense. I would try the angle of being non-local as potentially predisposing to “un-preferential treatment”. Why did they dig through heaven and hell to identify his DNA and yet neglected other male DNAs found in the house that, place-wise, could have had more relevance?