Juan Martinez told the jury, "you are not supposed to speculate BEYOND what the evidence tells you." He also said, "you are not supposed to be investigators and try to find evidence that isn't there." He said, "you are to look at the facts which were presented to you in court, and only those facts, and come to a determination whether or not those facts point to guilt beyond a reasonable doubt."
***** I am paraphrasing him from memory from the Arias and Chrisman trials, but I'm pretty sure I came pretty close to what he actually said. Anyone who cares to check can look at the closing arguments in the Jodi Arias trial and the Richard Chrisman trial.
With the example of RS that was stated in your post, you are speculating on behalf of Raffaelo. That is pure speculation. Rather than look objectively at what he actually said, and what the computer and phone records actually show. You are also speculating about his state of mind. We are not supposed to speculate on "other things" they could have been doing unrelated to the crime. I am not talking about here on this thread, I'm responding to what you said in your posts, which is from the point-of-view of a jury in finding reasonable doubt. What is in evidence is what they said they were doing, which was at Raffaelo's place, eating, on the computer, having sex, then sleeping until 10 am. That is what is in the evidence of what they were doing at the time of the murder. Ambiguous, "other things" are not in evidence.
Same with the second paragraph. We are not supposed to speculate on what else she "could have done." We don't know whether she thought they would pin the murder on her or not. We don't know whether she felt guilty or not, in fact the evidence points more the other way (callous remarks).
And I guess the prosecution is not speculating when they say there was some sort of sex game gone wrong going on nor are they speculating about using a weapon that does not even have blood on it. Nor are they speculating about their being 2 murder weapons instead of one (maybe there is just one missing murder weapon that fits the cuts and has blood on it). Nor are they speculating that luminal prints in the home have a sinister implication as opposed to someone just walking barefoot in their own home.
I would not necessarily trust a prosecutor's explanation of what reasonable doubt is anyway. Of course, every jury knows not to speculate, but what they mean is they do not want the jury to speculate on scenarios and then accept those scenarios as fact that can be used to support the jury's verdict. Like in Scott Peterson, they did not want the jury speculating on how he killed her or how exactly he got her in the water - they only needed to decide whether he killed it, matter of death need not be decided. In that case there was a powerful motive and circumstantial evidence he wanted his wife gone.
Here it is in no way speculation because I am not saying those things definitely happened. I am just using those examples to say we just do not know what happened and that a completely innocent explanation can be explained by the facts in evidence, it is not speculation to say that one scenario is that they were simply not in the murder room because there is no reliable forensic evidence tying them to that room. No reliable DNA, no blood, nothing. The absence of evidence in a room coated with RG's evidence is very telling on who did the crime.
It is prosecution's burden not the defenses. And all I have ever seen from the prosecution is one scenario implying some sex game stitching together various people's statements about AK combined with some apparent inconsisenties in AK and RS and then to appease the fact they have nothing tying her to the actual murder, some DNA evidence that 2 dozen experts discredited.
We will see in a few weeks what the court finds and then ultimately what the higher courts agree with. Mignini IMO did himself no favors by going so over the top in his argument speculating about the sex. It just makes his case look all the more ridiculous. Not sure if he is done yet but maybe there will be more tomorrow.