Sorry for the delayed reply. I rather agree that he was valuable at the Met in the Wagner wing, but they did not let him do Fidelio either, and San Francisco Opera, which did not get Melchior much, let him do Otello. He did an unbelievable number of performances of his major Wagner roles.
On the other subject, small world. My former voice teacher, Will Crutchfield, contributes to Opera News and I used to attend Peabody Conservatory in Baltimore. Perhaps I can sing for you all at Opera North (or is it Opera Delaware?) someday!