The language in the WYAY application about "there will be an application from KZ" indicates that the two owners have probably worked out an agreement. If you will do this, I will do this. If you will do this, I will pay your expenses to do that.
As secondchoice tries to mention, there's no need for any of that. Cumulus owns both and probably views a full-market signal in Atlanta as being more desirable than a full class C in Chattanooga.