Well, happenstances like that are real enough in life. It was a logical question the Geary.
And, what if Fredo hadn't screwed up with his answer? Michael knew he had to have Roth killed before the end of the Presidential party, when Roth had set him up to be killed. He'd have had to leave Havana and return to Tahoe without knowing who was the traitor was--a very scary situation for him and his family.

Thank you, FFC, for inserting the Superman scene in II and sparing Michael and his family all that anxiety.