Welcome aboard Tony. I do not agree that Michael would have done it himself. In fact after he killed Sollozo and McCluskey, that was pretty much it for him. After that he would order others to do the wet work.

One thing about that scene I never understood was that the Rosato Brothers did that "Michael Corleone says hello," thing presumably to make Pentangeli think that Michael had betrayed him. But if they were going to kill him, what difference would it have made? The only apparent reason the hit failed was that a cop wandered into the bar and stared asking questions ....unless Roth staged it so that Pentangeli would NOT die, and then be kept alive in secret.