That may be true, but then Marc shouldn't have been secretly backchanneling support. He should be asking the tough questions, not advising against the challenge

That may be true, but then Marc shouldn't have been secretly backchanneling support. He should be asking the tough questions, not advising against the challenges of the board. Did Marc say to the other members, "hey I'm going to give Mark a heads up on this"? Likely not. If Zuckerberg was not allowed to keep control I assume he wouldn't be divesting so I see no benefit to shareholders.