Even if they wanted to try to do that such action wouldn't seem likely as that might interfere with the IPO / eventual stock price and would interfere with their wishes to make a load of cash on the IPO.

In short do you take a shot at the head of a company about to make you a ton of money even if you think they've made mistakes? Probably not.

In fact from my understanding from institutional investors they often are privy to concerns, actions, and screw ups by companies they're heavily invested in, but don't raise concerns because ... they're heavily invested and don't want to rock the boat if it is doing well otherwise.

There was. That is what several members of the board represent: They are chosen by the shareholders.