TB,I disagree about the Pentangeli murder conversation. Mike asks Roth if he objects to Pentangeli's murder and Roth says that he is small potatos. I think Michael was trying to confirm the suspected link between Roth and the Rosatos. That's why he asked him that question in Cuba.
What did Michael need to confirm in Miami? He already knew that Roth was backing the Rosatos because it was the basis of Frankie's complaint to him in the boathouse in Tahoe. He took the Rosatos' side in that argument because he needed to in order to cement his deal with Roth. I believe that his statement to Roth in Miami, "Frank Pentangeli is a dead man...you don't object?" was his way of putting Roth at ease, making him think that he, Michael, believed that Frankie, not Roth, was behind the Tahoe shooting.
