But why wouldn't Vito know about Fanucci? He had lived in the neighbourhood for sixtenn years--and he hadn't come across the man?

And Michael talking with Fabrizzio translating is I think purely down to Pacino's lack of fluent Italian; why would Michael want to speak English and risk letting word get out that there was an English speaking paisan in town (and thus expose himself to possible attacks from those looking for him)?

Mick