The prosecution case has all three culprits involved in the murder. Absence of evidence in Meredith's bedroom, or on either side of her body, is not evidence of absence. There is evidence that more than one person was directly involved in her murder. Evidence at the crime scene implicates Rudy Guede, Amanda Knox and Raffale Sollecito.
However, it would not be surprising to learn that all three perceive that their role was minimal, and therefore that they are not responsible for the murder. Guede has already stated as much.
bbm
Yes, exactly. In my theory, all 3 have shared responsibility for what happened, even if Rudy did the overkill stabbing. That is why no 3 are talking about the others - b/c they ALL 3 have things to hide.
Rudy is probably thinking - well, she was first stabbed by one of them (Amanda or RS). The idea of the prank was theirs (Amanda and RS). THey all together came up with the idea of the overkill. And Amanda and RS did the staging of the body/burglary/messing with crime scece, etc.. He probably justifies it in his mind as well, I was covering up for all 3 of us and it was just an accident, I had to cover up the accident to "save" all 3 of us.
Amanda and RS are thinking - we only stabbed her once and that was a total accident. We did not stab her more times (Rudy did). She would have died anyway, but it was becuase of an accident. Or, alternatively, Rudy actually killed her because of the overkill stab wounds to make it look like an intentional murder. So you see, we did not actually have much part in her actual killing.
Yes, you are right, they can each individually minimize their part in it.