I don't mean to pick on you (and welcome to WS). You're just bringing up some common ideas about the case.
I have a question about the EA theory: on a fair-skinned child like JBR, how could anyone have planned to torture her with a garrote without fearing they would leave tell-tale marks?
My family's coloring is similar to that of the Rs and, unless we are very well tanned, we show a record of the most casual contacts. I can leave a visible (and painless) bruise clutching my own arm.
Of course, I can't begin to fathom the thinking of someone who would garrote a child for sexual pleasure; and perhaps the garrote was making its "debut" on the night JBR died. But I doubt anyone could have tightened that cord tight enough to cut off JBR's wind without also leaving an obvious (and alarming) bruise.
Thanks for the good point, which to me signifies the garrote not being used prior to the night of the murder, which further signifies it had only two possible purposes: a murder weapon or staging or both.