if Fredo is "in" on alot of what Roth is up to (he knows about Questadt), then why not reveal to Roth the frameup of Geary? Certainly Roth could use that knowledge to his advantage possibly even neutralizing Mike's use of it.
It's possible he did just that. My long-held view is that Geary was part of the plot to trap Michael into five counts of perjury. If Questadt belonged to Roth, and Questadt was counsel to the Senate committee that Geary was a member of, then he could have told Geary: "Michael Corleone trapped you in that brothel murder. Here's your opportunity to catch him in a perjury trap. He doesn't know we have Pentangeli. He thinks Cicci is the only witness we have against him. So, when Cicci testifies, ask Cicci if he ever got a direct order from Michael Corleone. When he says that he didn't, Michael will be relaxed, and think he can get away with lying under oath. Then we'll drop Pentangeli on him and bada-BING! He's going away for five years on each count of perjury."
If Geary protested that Michael could retaliate with the brothel murder story, Questadt could say: "If he's convicted of perjury, he's a liar for all time. Who'd believe him if he told the brothel murder story?"
