Nothing that we know, which is little, makes sense. I'm sure it made sense to the ME on Day 1.
So, I don't know what happened. But these are my thoughts.
If this was a double suicide (doubt it), I would think there would have been a gentler method chosen and perhaps notes. The absence of a note means little; only approximately one third of people dying by suicide leave notes. But I can't imagine if they decided to go together (not seeing what would lead to that), that they wouldn't give their family some sort of explanation. But, I honestly don't see them both deciding to end their lives.
If this was a murder suicide, I don't understand the violent and convoluted method, or why or how BS would move a body and go to all the effort to stage HS's hanging and then try to imitate that with his own hanging. Even if he staged this complicated scene, this was a smart man who surely knew the authorities would soon sort that out. I also think if he hoped to convince it was a double suicide through the staging, there surely would have been suicide notes to suggest this was a joint decision based on a reason he thought would be compelling to those who knew him.
If this was a double murder, again, this was a convoluted and time-intensive method. And I don't believe that message-sending or water symbolism, or whatever, were part of any murder scenario.
So, none of it makes much sense in the context of the little that we know. I don't get it. I guess we'll see. Or in the case of a murder-suicide, we won't...but will, through the deafening silence itself. There is just no way a double murder will not be made public, and loudly, with an obvious search for the killer(s).