I agree with your analysis. My opinion with the pledging would be with the Bonanno's (back then) but because of his blood ties with the old country and Vito's father being who he is; would still be considered a made guy in his hometown.
This subject came about when you discussed Nick in an earlier post about him being a lone wolf and was exiled from Montreal with the intervention of NY.
An example of this is when Paolo Violi was caught in a conversation with the Sicilians from the old country on how to handle a made guy(Nick) that settles in another country and wanted to impose restrictions on him.