"Dark Horse" is a little over two years old and it had been on AC for quite a time. Just now, early in the morning, KMGL aired "Dark Horse" with the Hip-Hop part included. KMGL is like the only AC I knew off the top of my head that plays the hip-hop version of "Dark Horse" ever since the song made it on AC. Other AC like KVIL, KCKC, and WLTW plays the non-hip-hop version of "Dark Horse".
The song is a little over two years old and KMGL just started adding it which is weird because KMGL isn't slow at adding Katy's songs. When "Roar" was released in August 2013, KMGL already had it spinning around 12 per week in September 2013 and usually Top 40 songs like that don't make it to AC half-a-year or a year later usually. For some reason, KMGL delayed the add for "Dark Horse" two years after it had been charted on AC and they played the hip-hop version instead unlike most AC.