Clay has made a name for himself, built a platform, created a persona, connected to the right people, has landed a network radio gig and a network TV gig, and is movin' on up. Whatever he chooses to do next will be whatever he sees is best for his continued climb up the sports personality ladder. If it is best he continue with The Zone, he will. If it's going to best for him to take over for Rome, he'll do that. The point is he has successfully maneuvered his career to the point where, once his Zone contract expires, he'll have choices available that will likely outweigh afternoon drive in Market 45. So that's why most observers think he'll be moving on to the next big thing.
If you haven't read the article and comments posted at the link in the first message of this thread, please go back and so. This covers some of the ground you are trying to cover again. I do not support the author's conclusion, though, I tend to think more like the first commenter to the article, though not entirely. Kuharsky seems to me a likely person to move into 3HL. I also believe The Zone would never turn over its afternoon drive to a syndicated show. I am of the opinion that if/when Finebaum is heard here, it'll be his first two hous airing live before afternoon drive, and/or some or all of the show on delay. Or some of the other scenarios mentioned by the commenters.