For the record, a cousin of mine that I talked into watching the show and him and his wife were up to the 1st ep of season 4. I asked him what intrigued him more about the show, the mysteries or the characters.
He said the mysteries and added "of course!" to it. Then he just went on and on about all kinds of stuff that has come up. I told him to watch The Constant and then never watch the show again.
This character thing was something that Darlton preached and preached for the last year and a half or so to condition some of us to believe it and minimize the mysteries. If you search your hearts, you'll know this to be true . . .