FWIW, Underhill is saying that he thinks that it's Glenn/McCarthy as the Saints top choice for HC. Could be either and they will continue to pursue Glenn. So we may not know anything soon since Glenn is in the playoffs.
IMO, that makes it possible that McCarty takes the Chicago job before we are in a position to really offer the job to him.
If you interview McCarthy and he's still got the "juice" needed to endure a soft rebuild, you don't let him out of the building. Glenn might actually pick the Jets over the Saints when all is said and done if both options are on the table.