If Sonny had shut up following on similar thread

I too believe, Vito was a dead man either way - Yes or No - It was just a matter of time

Turnbull's posts on Barzini or similar, among others,
Barzini being the 'silent partner' [was using Sollozzo] to become Numero Uno

Barzini was getting “impatient with being the Number Two Don, wanted to dethrone Vito and take over
Barzini thought of himself as No.1 waiting in the wings, impatient to be the top dog in NYC