Bill Voss was commenting within 3 day his "theory" to the news, and it was   

In your mind, 2 pilots falling asleep is an excuse for overflying your destination, without descending, and missing an hour of ATC calls? It is preposterous. Are you more of a subject matter expert Than Voss? If so, please identify your expertise. You don't know that the pilots told the truth, they told varying versions. None of it could be corroborated. None of their attempts to explain away the incident take into account the most damning evidence, that no descent preparation had taken place, and that the pilots missed 1 hours of ATC calls. That itself is an egregious error. Most controllers on center frequency get irritated if you miss 1 radio call.