Good point. I also read that Rudy refused to identify the signature on the letter, which means that it was not authenticated. To allow the prosecution to read an unauthenticated hearsay accusation against a criminal defendant is absurd.
That the proven perpetrator of a crime can point out two other people in a courtroom, without those two people or their attorneys being allowed to ask him follow up questions is truly absurd, and it's very hard to see how this is in the interest of justice.
But since this is the Italian way of justice, let's hope what logically follows from that is this: When the judges take today's testimony of Rudy Guede into account they will agree with each other that everything Rudy Guede says regarding that night and that points to the guilt of Knox and Sollecito is of absolutely no value whatsoever. Moreover, the fact once again underlined that he's clearly lying cannot exonerate them, but it's even more possible, now that he has refused to answer questions about the details, that the things he is lying about is that he's trying to pin the murder he committed on his own on two others for his own benefit. It is very unlikely he does this to cover for Knox and Sollecito.
He has both before and after the murder told people stories about the murder, which though these stories are clearly untrue, both have in common that Knox and Sollecito were not present. There is reason to believe that those stories
can be true in at least that respect. Especially since we, again, can't see any reason that these stories were an attempt to clear Knox and Sollecito. They were meant to divert guilt from Guede himself, the first time before he knew for sure that the police would go down the path that the pair were involved with him, Guede, and without knowing the police were listening in, which gives the Skype call the character of a kind of free spoken, of guard, unpressured, spontanious statement. The second time after he already told another story, already proven false by the court in his sentence, to the effect that Knox and Sollecito were the real killers without his involvment. In prison he retracts this story and is in addition to his previous crimes guilty of perjury, if this is true.
Anyway, this leads to a certain amount of reasonable doubt in itself. There is a clear chance that Guede is correct when he's stating that Knox and Sollecito were not there, because the only thing we know for sure is that he was there when Meredith Kercher was murdered. He saw what happened and his confessions can be true on this point, as that truth is against his own interests and clearly not made in the purpose to benefit the accused.