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Now that the governor has made it plain that he had no interest in investigating for the months that this was building up and now that subpoenas and prosecutors are flying about, Christie's window for investigation has definitely closed.
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It seems like that's an important point. When the bridge was first shut down and complaints started rolling in, it seems like Christie would have asked his people "What the hell is going on?" Even if he didn't suspect his own staff of misconduct, he certainly would have wanted to know who to blame. "Traffic study? What the hell kind of traffic study? What do you study by shutting down the bridge? Gimme some names. I want their heads." It's very hard to believe that Christie would have said "Traffic study? Oh, OK," unless he didn't want to hear the truth.