I will try to be more clear. I will repeat the first 2 or 3 paragraphs from my post and highlight the questions. Then I will restate the questions.
Questions restated:
1. What is the constitutional justification for including "judicial facts" or findings from a Fast-Track trial [Rudy Guede's trial] in an adversarial trial [of Amanda Knox and Raffaele Sollecito]? Knox and Sollecito had no representation at Guede's trial. (Use of such "judicial facts" or findings in an adversarial trial appear contrary to at least Clauses (sentences) 5, 7, and 8 of Article 111.)
A justification is expressed by Sentence 29 of 2009 of the Constitutional Court (the Constitutional sentence that decides about compatibility of art. 238bis Penal Procedure Code with art. 111 of Constitution):
http://www.cortecostituzionale.it/actionSchedaPronuncia.do?anno=2009&numero=29
The art. 238bis is about sentences that have become res judicata; the art. 238 is similar, but allows the transportation from one trial to another also of other documentation.
An overview about interpretation of adversarial principles in art. 111 as explained by scholars (an article from the review Diritto Penale Contemporaneo):
http://http://www.penalecontemporaneo.it/upload/GALANTINI_GIUSTO%20PROCESSO%20E%20GARANZIA%20COSTITUZIONALE.pdf
Also: as for art. 238 (other documentation that is not just res judicata, such as withess statements),
the Constitutional Court, declared with Sentence 361 of October 26. - November 2. 1998 that some previous paragraphs were illegitimate under art. 111 of Constitution, namely paragraphs 4 of art. 238
but limited to the event in which the witness refusing to answer is being examined under art. 210 of the procedure code, and answering questions about
the previous declarations that the witness had made as he/she was already witness before a judicial authority on a previous time. (it does not apply to extra-judicial declarations, that is declaration that were made by a person while the same person was not invested with the status of witness: such extra-judicial declarations
can be transported as evidence into other trials)
The came Sentence 361 of October 26./November 2. - 1998 of the Constitutional Court stated that all other paragraphs of art. 238 (usability of documents and testimonies from a trial as evidence into a different trial) is compatible with art. 111 of the Constitution.
Art. 111 of the Italian Constitution has been among the objects of a conference meeting among three Constitutional Courts of Europe (of Italy, Spain and Portugal) about principles like the "adversarial principle" in forming the evidence and others:
http://www.cortecostituzionale.it/documenti/convegni_seminari/Diritto_processuale_penale.pdf