Why let Zaza know that Michael was on to him? What happened to keeping friends close and enemies closer? And when did Michael previously care what people called him behind his back as long as they did what he wanted?
But that was just it, Zasa wasn't doing what he wanted. He was saying 'fuck Michael Corleone' and was dealing drugs in many old neighborhoods. Not to mention that he was probably already planning to take over and move Michael out of the picture.
I am not sure about that. Aren't screenplays often substantially re-written in a very short time anyway?
If you want to be sure, just read one of the reference books about the films; Harlan Lebo's The Godfather Legacy or The Godfather Book by Peter Cowie.
