He knew Frankie was garroted at the Rosato Brothers meeting, and he knew Michael didn't give the order to kill him. That he was kept alive in secret had to have been engineered by Roth, hence the "played it beautifully" line.
"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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