I don't know and neither do you. Them "already having our guy" is just something you made up.
What has been reported is that Zeigler was a big part of the search that isn't complete and he bailed to the Titans before it was done. If McCarthy or the 3 others that have been interviewed in person were the guy, they can be hired right now and they haven't been. If It's Kellen Moore or Kliff Kingsbury then he left before they interviewed. Those are facts.