Good point TB because if the Roatos were chiseling on Corleone territory with Roth's blessing, why wouldn't Roth through Ola made some kind of pro forma gesture to Michael about this, e.g. "I have to back the Rosatos in New York, and you'll get back whatever Pentangeli loses from our deal in Havana," just go along with it.

When Frankie approached Michael in Tahoe, it should have been a warning to him that Roth was not playing fairly. Frankie actually saw through it in his own way before Michael did.