Sorry I disagree with you Robo, the scene early on in GFII where Michael puts Tom in charge tells us he really did think of Tom as a brother and he also says he has complete faith in him etc. What I could never understand was the last scene with Neri, but as someone has said I now think it was jsut to show michael was becoming very paranoid.
I wouldn't say Tom failed at all, he was not to blame for anything, he was being reasonable.
I'm really glad Robert Duval must have became greedy and wanted a lot of money for GFIII, as he saved himself from being in that not so good GF film. And as I've already said I wouldn't want to see him killed like Fredo and Sonny. He goes out with dignity.