It's tough for a station to win with constant turn over, either on the air or in management. We were talking about this very subject regardig CBS Radio's sluggish ratings in a previous tread. If you look at the stations in Vegas that are winning (KOMP, KKLZ, Point, KSNE, etc), they have had consistency over the years with familiar voices on the air. As well as managers that know the market and have strong relationships with decision makers in Vegas. KWNR (or any station) will never win going thru 4 different morning shows and (so to be) 3 PD's in two years.
Best of luck to Brad in Pheonix. I'm sure he's in a better and more stable place.