Its worth listening to the podcast. They do discuss Kasich and Pence and say that if either showed serious interest (and especially if others ran into trouble) they could become top tier.
We are getting closer and closer to the point where it is hard to discuss people who arent doing anything (or very little) in terms of setting up campaigns. So the bias is towards those who are clearly running.
Yeah, I get that. But Pence has shown no interest in running and even shut down a bill allowing him to run for president and Governor simultaneously. Meanwhile, Kasich has been open about considering a run and touring the early primary states. If you're going to include one but not the other, it should be Kasich.
Also, if they're going to include Warren on the D side then they should include Romney on the R side.