That's about right, although K-Lite (KLTX 95.7) started messing around with Smooth Jazz, which didn't take long to lose their foothold as Light AC leader. The backstory is: They hired a new GM for KJR and KLTX who had zero radio experience other than a successful track record in radio ad sales for the Sonics. Anyway, she personally preferred Smooth Jazz and started tinkering with K-Lite by insisting on SJ in the evenings. When the existing PD, who was very analytical when it came to music research and positioning warned the new GM that adding SJ would be disastrous, she canned him. The evening jock was named PD and added SJ to the evening line up as "City Lites" (gag). The following few months I remember sitting in management meetings hearing the GM predict that eventually SJ would be the next thing and that we need to get ahead of it. According to her, Lite AC was dead. For a short time before Bob Case flipped KLTX to KJR-FM (Classic Hits), K-Lite was 100% SJ, and KRWM (K-Worm), wormed their way into the Lite AC leader.
I know, every market has similar examples, but this has to go down as one of the top, worst programming decisions in Seattle Radio history.
Number two (that I was involved with), was when our corporate PD in Seattle was tinkering with the format on WAXY in Miami and the station promptly went from first to the absolute bottom in one book. When doing my first walk through after purchasing the station, the GM warned me not to let the corporate office tinker with the format or even the audio processing or risk facing certain doom. Guess he was right!