DC I agree that Cicci was testifying to help them set Michael up for perjury charges. Cicci testifies that he was a button man, and that he killed people.
What he could not say was that Michael corleone ordered him to kill people. He could have testified that Pentangeli ordered him to do that, but Pentangeli had been given immunity. So where they leave Cicci is with the leading question Did the family have buffers? To which Willie gave his famous answer.
"Io sono stanco, sono imbigliato, and I wan't everyone here to know, there ain't gonna be no trouble from me..Don Corleone..Cicc' a port!"
"I stood in the courtroom like a fool."
"I am Constanza: Lord of the idiots."
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