It is not just Tulsa. In markets much larger, the PD does pull a shift. They usually pull a 2 to 3 hour shift.
I think it makes sense. If they don't have a regular shift, they should fill-in or even voice-track a shift. Keeps them in the game.
I don't see a station like KBEZ keeping their PD off-air for long. Haven't heard the new show on KHITS. I did hear the 92.1 show talking about them. Always great when you can get the competition to promote your new show.
Enjoy your Labor Day. I hope most of you got to track your shows.