I agree with this, but to a point.
I agree that the bindings and the duct tape were simply used for staging. Why? Because the staging is beyond amateur. For example, if JBR's hands were bound and her mouth duct taped, she could have simply removed the duct tape with her wrists still bound, because her hands were "tied" in front of her, not behind. Some will stay the strangulation would still silence her, and that maybe she did remove it, but then that would mean that the killer went out of his/her way to re-tape her mouth after death -- there would be zero reason for the killer to do this, even if you want to believe the intruder/killer was staging the body.
That's what LE said, too.
I read on the candyrose website that the nightie was in the dryer with the blanket immediately before it was found with JBR. The maid knew it was there, and confirmed that the only other person who would have known that both could be found in the dryer was PR. Basically, PR grabbed the blanket out of the dryer in a panic/hurry and the nightie simply "clung" to the blanket. I don't think it was there for any particular staging element; it simply clung to the blanket (which was used for the staging). Why that particular blanket is anyone's guess.
Maybe because it was available. But I'm not sold on the nightgown being there by accident. Not yet.