All valid points.
I never understood how Neri got back as fast as he did, nor how quickly the news traveled about the other dons making deals and about Altobello planning to "retire" in Sicily. All this information was available a few hours after the hit when the Corleones were meeting in the Kitchen at Michaels.
"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."
| 
