You do realize that when Guede was convicted, his confession was that he was there with Amanda Knox and her boyfriend, and that the previously uninvolved judge who found Guede guilty also named Knox and her boyfriend as co-conspirators to murder, in a trial separate from those at issue in this current brouhaha?
But as you pointed out Guede has made many statements that have been proven to be untrue, and probably delivered under prosecutorial duress, including his statement that he sexually assaulted Kerchner when forensics said that there was no sexual assault.
He's not a reliable witness --
Do you have another source???