Sorry to brand this theory, although viable... but there is a big reason K104 is tops - crossover. KISS runs CH-URBAN straight in the ground and the LWG often want to just get their groove on up the dial at KKDA. Recently, KHKS has been pushing almost an identical format, with the routine exception of a Christina Aguliera song mixed in there.
About who is missing? Personal reasons (the WIG) or professional ones with the blossoming comedienne (what I have been told, aside from wanting a MAJOR pay raise), KKDA will stay on top unless their internal issues knock them off.