I don't mean he got dirty as in popping anyone nor do I think you have to. But I sure as hell don't see everyone falling in line with Leonardo either. He was in on most of Vito's legit dealings and more than likely a good bit of dirty dealings too, but he has never been thought of as a gangster. That's what I mean by getting his hands dirty. Now that everyone around him is dead I seriously doubt he changes career paths.