The last paragraph says Idelson (who WAS IN HOLLYWOOD) will TAKE OVER his old role - meaning someone else has been playing his role. And as was noted just a few days ago, that was Johnny Coons.
It now seems safe to say that Idelson played Rush in the 1946 season.
It breaks my heart to even hear this and relay this news to you. It may not be true but I'm afraid it probably is.
In the interview (below) actor Hugh Studebaker is a bit confused, no doubt, but he isn't so confused to remember that Johnny Coons played Rush in either 1945 or 1946 and perhaps both those years and series. (You'll notice that there is no talk of Bill Idelson in this brief interview.)
This was the time after the original series and the series had changed sponsors and networks and had included many "real characters," including Studebaker as Rishigan Fishigan.