You don't know and neither do I. But it's possible that the people in the Hyatt had actually been there much longer than anyone in the Superdome was. They may have been cleaner and more comfortable than the folks at the Superdome, but they may have been without food and water longer. The hotels were not provisioned to feed hundreds for a week. Most of the rooms were unusable due to broken glass. Hyatt Corp. may have paid for those buses to come get the people when they realized nobody was coming for them and it was unsafe for them to stay.
Better to ask the idiots in charge of the city and its alleged disater plan why there were people still waiting for buses at the Superdome for so long.
I have read ..somewhere...(so much info coming out)...that buses had been ordered (going through much red tape) by the hotel CEO's to get its patrons out...
..BUT! when the buses arrived, they were commandeered by, I think, local officials, and the people were left stranded.
Thus, going to the head of the line seems only fair to me.