That was Steve in Columbia that did that “break” thing.
It was probably all a branding thing. The Jack FM branding is still very popular. I know Chuck FM was being licensed from Apex in Charleston (owner of 101.7 Chuck FM there)....Apex is selling their cluster to Saga so perhaps there was uncertainty in keeping the branding so they went with Jack FM which is basically all pre packaged from the logo to the liners.
I still find it a crowded market for Magic, Earth, WROQ, AND Chuck/Jack. Earth’s 70s/80s/90s playlist really hurt Chuck FM’s ratings.