The problem faced by the investigators in supporting a lone-wolf narrative has been amply discussed. One thing you fail to include in your dismissal of the evidence is that, to convict RG alone, the prosecution would have to prove beyond a reasonable doubt that he acted alone. As we know, the evidence supplied by the forensics teams made this implausible or impossible:
- Prove Rudy entered through the window.
- Prove all the wounds on Meredith's body were due to a single attacker.
- Prove all the DNA evidence indicating others was falsified/contaminated/transferred.
- Prove the bathmat print was Rudy's.
- Accept the missing alibis of the other suspects.
- Disprove witness statements placing either Amanda or Raffaele elsewhere.
That's just six points but each of them require a burden of proof investigators were unable to supply for the prosecution. We haven't and shouldn't see the medical examiner's reports or photos but those who have are under no illusions that there were multiple attackers. It's only here on the interwebs that we're able to diminish the value of the forensics (DNA, autopsy, luminol) while those in the courtroom were deeply impressed.
Hume would have been impressed too. He was a sceptic but he didn't outlaw the value of overwhelming evidence altogether.
The argument contained in this post is......unusual........
The prosecution may, for example, have felt that Guede was definitely involved, but that he may or may not have had accomplices as yet unidentified. Under these circumstances, he could certainly have been tried and convicted on the assault and murder charges without the prosecution ever having to prove that he acted alone. In addition to that overarching point, many of the other "necessary proofs" mentioned in this post are wrong too:
1) The prosecution would not "have" to "prove" that Guede entered through the window - they would only have to show that either he (or an accomplice) broke and entered or he (or an accomplice) staged a break-in after the murder.
2) Even if the prosecution presented a "lone attacker" scenario, they wouldn't have to "prove" that Meredith's wounds were caused by only one person. They would merely have to prove that her wounds were
consistent with having been inflicted by only one person. The wounds might
also be consistent with having been inflicted by two or more people, but that would be irrelevant if they were also consistent with a lone attacker. As an illustration, if a murder victim has two bullets inside him that were found to be fired from the same gun, this is consistent with a single gunman having fired both shots. But it's also consistent of Murderer A firing a shot at the victim, then passing the gun to Murderer B to administer a coup de grace.
3) The argument that the police would have to "accept the missing alibis" of AK and RS is pure nonsense. I don't believe that I have an alibi for my whereabouts between 2100 CET and 23.30 CET on 1 November 2007. But the Perugia police no more have to accept my "missing alibi" than they have to accept the "missing alibis" of AK, RS or anyone else if they exclude them as suspects.
4) What on earth does "Disprove witness statements placing either Amanda or Raffaele elsewhere" mean? I have no idea why the police would want or need to do this if they were seeking to charge Guede alone (i.e. not AK or RS) with the assault/murder. It's not even as if any witnesses placed AK or RS in the murder house at the time of the murder. That would be problematic if such witnesses existed, but they don't. And it's worth remembering that even if AK told the police she was at RS's apartment at the same time that some "witnesses" reported seeing AK/RS at the basketball court, that's not any kind of necessary proof that AK/RS committed the crime of murder.