I agree with everything you posted, LW. But I don't think it's certain that Vito intended to bring Michael into the family business as his successor, or as Sonny's second-in-command. If Sonny had lived and held the fort until Vito recovered, Vito may have worked to bring Michael back to America, to finish college, to be a lawyer, and to work to legitimize the family.

Ntra la porta tua lu sangu � sparsu,
E nun me mporta si ce muoru accisu...
E s'iddu muoru e vaju mparadisu
Si nun ce truovo a ttia, mancu ce trasu.