A: Polls show little movement, with Ford in the lead, Smitherman a strong-but-not-quite-competitive second, and the rest scattered below 15 percent with a large group of undecideds. In this scenario I think Rossi fades fast. It's hard to think of how he could possibly grab more headlines, and the media will quickly tire of him if the ones he has produced aren't generating momentum. Maybe he drops out, maybe not. We now have the beginnings of a two-horse race, as Rossi, Thomson, and Pantalone supporters begin to think about their candidate's genuine chances. In this scenario I think Thomson also fades quickly. Pantalone is harder to gauge. Smitherman then embraces role as centrist, big tent guy vs Rob the Wrecker.
B: Rossi cuts significantly into Ford's support, while Smitherman's remains stable. In this barnburner, we have the three of them all in the 20s with Thomson and Pantalone not far behind. I think at this point there would be pretty much a free-for-all--a five-way, five-week fight for headlines and wedge issues. Rossi will see momentum and won't let up, while the others will keep trying to turn up the volume to gain the small groups of voters that could put them in the lead. Ground game becomes crucial in this one, which I think would probably benefit Ford (thanks to trucked-in 905ers) and Smitherman (leaning on Liberal party machine). But this one could still go any one of five ways, and could even result in a Mayor Thomson or Pantalone.
What fun!