If Barzini gave Sol the go ahead to kill Vito, he had to know that Santino would not have the poliical and judicial protection necessary to run a drug operation, so perhaps Plan B could have been that Sol would kill Vito, and pick up the pieces of the Corleone family and leave Tat with his hookers.
"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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