I think their butting heads eventually got on both of their nerves. John would derail the show just to get under Leo’s skin. And Leo became increasingly ridged with the show structure. The show was losing popularity and I think some guests said they didn’t like John because he was cranky and his politics, but the real issue was probably that the studio was no longer as convenient for people to get to.

At the same time they both became increasingly politically polarized. John C Davorak became a full right wing conspiracy theorist. Leo increasingly embraced the left wing ideology of the moment.

It came to a head with that story about the kid making a clock and getting in trouble. Leo was all in on one side that it was about racism and such, with John suggesting he fell for a media lie.

I think John turned out to be right in the end. They did seem to patch things up with John appearing on a episode years later I think "a christmas miracle" was the title, but that was the last time he was on as far as I know.