I hate to say it this way, but "if it really is" his DNA all over the rest of the bra, that begs the question EVEN more the need for RS's assistance to touch only the metal hook.
We also have some "guilty" behavior from RG, such as his story of her bleeding to death, but he doesn't get her help, his fleeing the country and discarding his shoes, clothes, and mostlikely the murder weapon. And we have his lies about his "relationship" with MK, which neither his friends nor MK's substantiate.
RG places himself down at the cottage 20 minutes before newspapers say MK got home. Why is that? And if that's true, how does he meet AK and RS there at that time when they don't have any phone calls between them? How Do AK and RS meet RG when RS is busy on the phone with his father at that same time and AK at the door talking to RS's friend at around that same time?
Then there's the fact that RG approximates the death taking place around 920pm to 930pm. He's probably more correct than the experts, but the TOD approximations line up with what he said, so he's gotta be right about it. And if what RG says lines up with the evidence, we know RS accessed his cartoon at 926pm, so....
Even if some dispute that, the MOT report still says he did activity at 910pm, which would give him and AK 5 minutes to rush up to the cottage to orchestrate MK's murder for no aparent reason.
We also know RG is correct because we know from the broken down car and tow truck guy that the cottage was dark with zero activity between 1015pm and 1130pm.
The only stretch I can possibly make is that RS and AK could have come home to get the mop and walked in on RG fleeing the scene. The couple was traumatized for the night and decided to call the police in the morning, which would explain RG's crazy story. I really doubt that happened, but I just can see no scenero where a woman, whose dating a man whose family has money, would see the need to kill over 300 euros. IF Ak stole it and MK threatened to tell the other roommates, still don't see that as a reason to murder. I just don't see AK logically telling RS and RG to "sic" MK before she called the roommates or the police over that. I even LESS see RS and RG just blindly complying, etiher.
They say they don't need to prove motive, but over something as bizarre as their theory, I think they DO need to prove motive. I hate to be crass, but if RS's family does have money and AK was sleeping with him, why wouldn't she just try to pump him for money rather than steal from MK and murder MK over it? Makes no sense. Certainly makes no sense for RS to be murdering someone to "split" 300 euros take. That's absurd.
As for the sex game gone wrong....can't even get into how absurd that is. That theory requires physical contact, and as we can see from the evidence, only RG had physical contact with the victim, so does a knife attack, right? o I'm very unclear at how such a "hands on" kind of crime wouldn't require physical evidence from RS and AK, certainly rising higher than the level of "maybe" RS floated in and tapped the bra clasp before dipping the front of his right foot in blood, floating out and mysteriously depositing his footprint on the bathmat, doing an expert clean up, but leaving his footprint on the bathmat for the world to see.
I really wish I could make up a feasibly guilty scenerio, so I could understand that insistence upon guilt.
Very well laid out, w_m! I just have two comments:
1. I know you are trying to be fair to pro-guilt theories, but if AK and RS walked in on RG killing MK, I don't think their reaction would be "What a trauma! Let's wait until tomorrow to call LE." I think they would have been so hopped up on adrenaline that the natural reaction would have been to call LE immediately.
2. It's true the prosecution has no technical requirement to prove motive. But you're right about this case. Here, they are trying to assert motive to make up for the fact that they have little to no evidence of a group attack on MK.
They are playing a shell game, distracting the jury with lurid tales of motive to disguise their inability to prove that three people took part in the stabbing. (Or maybe it's two, now, with AK calling instructions from the other room in a language she didn't speak. Hard to keep track of Mignini's theories of the crime.)