A lot of this is informed by the book:

1. No. Barzini is the "up-and-comer," the leader of the next generation. He has a piece of everything, but he's not at the Corleone level, yet.

2. The book and the movie are vastly different as to what the territories are. In the movie, I think the Corleones are supposed to be strong in Manhattan and Brooklyn, and that Barzini is contesting that. Maybe from Queens, but I don't know.

3. At one point in the book, I think Sonny or Tom says they can muster a thousand guns. Not necessarily made men. They also say they have 100 button men out searching for Sollozzo, but I don't think that would include people protecting the mall, hospital, etc.

4. I think Michael is always getting his cut.

"All of these men were good listeners; patient men."