My issue with those theories: when they have opened “early”, the whole park has opened. That means they have a fully staffed park. They didn’t just call all those CMs at 4 am & tell them, get here by 5:30. They are planning to open early on some level, because they have those CMs scheduled to start that early.
And I agree with other posters, opening the whole park 1 -2 hours before announced opening & having guests arrive to find all the boarding groups gone well before opening only encourages more people to keep showing up earlier & earlier. I don’t know what the whole answer is, but I don’t know hat this is it.