So you don't need to complete everything to make Don of the Corleone family and Don of NYC?

I don't know if I have the patience to continue trying for a Traffic Accident execution, so it would be nice if I didn't have to do it.

Right now, I'm an Underboss. I have a handful of Barzini businesses/rackets and the Barzini compound to take over. I've completed the storyline and all the hits. In addition to the Traffic Accident execution that I haven't done, I have 2 film reels to collect and I need to dynamite the safes in the Barzini business I haven't taken over.