[Bubba Ho-Tep]

Not quite. He was called to testify, but asserted his right to say nothing (as he has all along).

Rudy Hermann Guede: Amanda Knox And Ex-Boyfriend Are The Killers

PERUGIA, Italy — A man convicted of murdering a British exchange student testified Monday that he believes her roommate, Amanda Knox, and her ex-boyfriend killed her – an accusation that prompted an emotional denial from Knox.

[Oztrich Boy]

That's all recent fog, created since the supposed jailhouse FOAF claim.

It doesn't alter that all convicted were convicted and sentenced, before and without any input from Guede

Knox and Sollecito were charged before his involvment was known, and convicted without testimony from him.