Indeed I watched the movie - and could not figure out why the focus was on Knox as the instigator in a sex crime. I just got hung up right there and thought the prosecutor was nuts. So men NEVER cover a body with a blanket? And because she may have covered the body, she is then the maniac who hatched the plan and instigated two guys to join her? Because Meredith complained about her tidiness as a roomate? Too much. Too big a leap....
(I'm snipping my quote of your post because I can't answer your autopsy questions. I'm sure someone else here will be able to do so.)
ziggy, I share your amazement at the prosecution's (and some posters') insistence that AK was some sort of sex-crime mastermind. (The movie dialog may be speculation, of course, or some other form of dramatic license. True crime movies are famous for taking a statement from one person and giving it to another in order to condense the action to two hours minus commercials. FWIW, I thought the movie showed AK and MK as friends and minimized any conflict between them.)
Yes, of course, male murderers sometimes cover their victims. It's sometimes assumed to be a sign that the killer knew and cared about his victim, but I don't know how close a relationship is required. If RG killed MK in a fit of rage and/or fear (she caught him in the middle of the burglary, say), he may well have felt some regret afterward and covered her with the duvet.
And I know women can instigate crimes, even ones of great brutality. But I'm with you: I can't think of many cases where a woman as young as AK instigated such a violent sex crime.
otto has pointed out, however, that some couples seem to have a chemistry that prompts each to act in ways he or she wouldn't act alone. So there's another possibility.