Guede is writing a book but does not have a publisher, according to his lawyers.
Karim Guede made matters worse for the visitors when he was sent off late on.
Under Italian law, Guede took a special fast-track trial which took place behind closed doors.
Guede chose to be tried separately from Knox and Sollecito because he feared a pact between the former lovers.
An Ivory Coast man, Rudy Guede, was convicted of the slaying in a separate proceeding and is serving a 16-year sentence.
They argued that the crime was solely the work of drifter Rudy Guede, who was convicted separately and is serving 16 years.
Sollecito wrote that he believed that Guede acted alone in killing Kercher.
Another man, Ivorian drifter Rudy Guede, was convicted separately of Kercher's killing.
Another man - Rudy Guede from Ivory Coast - was convicted in a separate trial and sentenced to 16 years for the killing.
Sollecito's defense lawyer Giulia Bongiorno also said during closing arguments to remember that the true evidence points to who they believe is the sole killer: Rudy Guede.
But another man, Rudy Hermann Guede, 22, who has joint Italian and Ivorian nationality, has already been convicted of her killing and was sentenced to 30 years in prison.
Rudy Guede, an Ivory Coast native who was raised by a local family in Perugia, was the first to be found guilty of the crime in a fast-track trial in 2008.
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Kercher's family has resisted theories that Guede acted alone.
Guede, who was convicted earlier of the crime, has admitted being in the villa where Kercher was killed, but has said an unknown assailant killed her while he was out of the room during his trial.
None of the journalists in the huge pack in Perugia over the years made any but the most casual efforts to uncover the life story and habits of small-time break-in artist Rudy Guede, whose fingerprints were in the murder room, who never denied being there as Kercher was bleeding to death, and who has been convicted of murdering her in a separate trial.
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