Seeing Questadt within the Roth 'entourage' would not necessarily indicate that he 'belongs' to Roth.

After all, Sen. Geary, who also served on the Hearings Commitee, was also a member of the Corleone 'entourage' in Havana on New Year's Eve...was that supposed to serve as public notice that Geary 'belonged' to Michael Corleone?

And if it does, then it's entirely possible that Michael already knew about the Questadt/Roth relationship, and the one thing Fredo could offer was really no big news except to the audience.

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