I think that, before the shooting, Roth really had Michael conned into thinking that Michael could take over Roth's empire without violence--and that Roth would simply fade away to a retirement of playing shuffleboard and pinochle with all the other Florida geezers.
I dont know about this TB. In the scene before the hit, Pentangeli chides Michael about giving his loyalty to a Jew over his own blood. Micke replies that Frankie knows that Vito did business with Hyman Roth, and Frankie says that Vito did business with Roth, respected Roth but NEVER TRUSTED Roth. If this is so that would have been something Vito passed along to Michael during the time he was training him to be Godfather. Michael also had to know that the Rosato Brothers who were working for Roth were giving Frankie a hard time, but because he was looking at the big picture -- Havana -- he didnt want Frankie to make trouble. After the hit, Michael makes the snide comment that Roth has been "dying of the same heart attack" for years, which is further evidence that he was always suspect of him. This all leads me to believe that Michael never fully trusted Roth either, and when the hit came he knew right away it was Roth who tried to do it.
"Io sono stanco, sono imbigliato, and I wan't everyone here to know, there ain't gonna be no trouble from me..Don Corleone..Cicc' a port!"
