Joining in here for the first time. I haven't read through all posts but have been following fairly closely. A few thoughts:
1) If this was a murder staged to look like a suicide, why leave the bindings on the ankles and wrists? - If she was, say, tied to a chair and held against her will for a period of time, maybe the thought process would be that the bindings would have left marks on her ankles and wrists and if removed before being staged to look like a hanging/suicide, the ME would likely still be able to determine that she had been bound by the wrists and ankles in some way prior, even if they had been removed.
2.) Loud music/party - Maybe the loud music was used to cover potential screaming/cries for help.
3.) Max was still alive when RN was found, but prior to Max's passing, he was established brain dead, right? Likely on life support and probably didn't just "pass away". The family probably had to make the decision to remove him from life support and likely would have been faced with making that horrible decision in the day and/or hours leading up to the next incident. You see where I'm going with that?
This is so bizarre, I can't form a theory. On the one hand, it seems possible that JS blamed her for the accident and had her murdered as retribution, but wouldn't it be just as easy for someone with his money and power to have her "vanished" or "disappeared"? Why an elaborate scenario like the staged hanging, nudity, etc.? I don't know what to think, but I will say I don't believe for a minute that she did this to herself.