Nothing against Dees and his talent, but a good deal of his popularity was likely due to the popularity of the station he was on.
I'd say it was the other way around. KIIS went through a series of formats, and had just flipped back to Top 40 when they hired Dees. His morning show was the anchor that made KIIS the powerhouse it was. He also had a great production team and management. He didn't do it alone. But KIIS was not the station it became until he took over morning drive.