Did you already forget about NWA and the morass at Detroit? 6 hours was nothing...........IIRC, some of them were out there for 12 hours and there was no possibility of getting them in without some snow removal at the terminal area.

This one was just a bad situation whereby the airline had no station at this airport at that hour and had to rely on another airline...........who had no protocols. A diversion always results in problems for an airline...........some worse than others.