Nino - When Blundetto is inviting Tony into that house but Tony refuses, and refuses to part with his briefcase, is that symbolic of Tony's inability to part with his identity (that of a parasite, the scorpion)?

Was that his chance to take on a new identity (become Finnerty), and become a new, normal guy that does not take advantage of others? (perhaps this does not make sense because Finnerty ripped off the monks, so "Finnerty" was not necessarily a good guy either)