My point is CBS's post-Stern morning drive strategy was a disaster. I did not say Stern's replacements and the radio medium were necessarily incompatible in all respects.
There's nothing that could've been done with Roth that would've made him a successful morning drive host in multiple large city markets on the stations that previously aired Stern. Thus, he was a terrible choice. Square peg meets round hole. As a nighttime host of a music-driven daypart on classic rock stations, he might've been effective.
Rover's sophomoric, lowest common denominator, very fake show was a terrible choice for WCKG in Chicago, the former WKRK-FM in Detroit, and other stations in the central U.S. The ratings are proof. WNCX Cleveland lucked out because their sister station in Cleveland was the flagship for Rover at the time, so they were able to escape that fate.
I never heard Carolla's morning show (other than brief snippets), but I do certainly agree he is a talented media personality and comedian. He was the one selection that had potential to succeed. The problem is - he was based on the west coast. That circumstance limited live morning drive distribution opportunities. If he were based in NYC and given proper support, the outcome certainly could've been much different. I suspect he would not have wanted to relocate to the east coast, though. I would love to know if CBS Radio brass ever attempted to make an inquiry along those lines.