If he hadn't revealed the vital information they had another witness for the Corleones to identify and counter that person, Michael couldn't have figured Pentangeli was alive
As I posted earlier: the Subcommittee chairman
had to reveal the names of all witnesses that he intended to call--including Pentangeli--because it was a public hearing. He
chose to reveal Pentangeli
after Michael testified in order to put him in the perjury trap engineered by Roth, through Questadt.
My view is still the same nobody could find any trace, no trail whatsoever connecting Michael so any investigation will end up deader than dead as it did, failing dismally
Michael testified that he owned "some stock" in the hotels, "but very little." But, keep in mind that Geary, when he attempted to "squeeze" Michael in the earlier scene at Anthony's party, started by saying that Michael "owned or controlled three hotels." Since he knew about Michael's hidden interests, he could have revealed that info to the Gaming Commission, which could have nailed Michael for perjury, or worse, irrespective of whether or not Pentangeli testified. He didn't because by that time, Michael had squeezed
him via the hooker murder. But, since Geary knew, it wouldn't be hard for the Commission's investigative staff to uncover Michael's hidden interests--if they wanted to or had reason to. The Gaming Commission was good at looking the other way when casino owners brought a lot of taxable income to the state. Bjut, they could turn on a dime if they wanted to.
