Bob Goen and Pat Finn tried out. As did Tim Brando. He almost got the job and yes, MG was only filling in until.Charlie fulfilled his commitment with Barris. Jack Clark specifically requested for Charlie to succeed him.
I'm curious as to where you heard that Charlie taking over was Jack's request.
As for Bob Goen and Pat Finn, according to David Baber's "Television Game Show Hosts Book", they auditioned when the show moved to CBS, to replace Rolf. The other auditions were Bob Eubanks, Chuck Henry, Marc Summers, and John Davidson. Not sure if anyone else was auditioned
Fixed a broken quote box. -knagl