The original story written by Marland was Darryl was the killer of Carolyn and did it for the money and to have full control of the company. Midway Marland changed it because he felt it was a repeat of the Douglas story and he didn't want Frannie duped by another man who turned out to be a killer again. So he had one of Darryl lame assistant frame him for murder because he wanted the money and felt Darryl didn't love Carolyn and he did. The revelation still did well either Rankin #2 or #3 for the week among the 11 soaps on the air at the time. IMO Marland made a mistake in changing the ending of the story.
Till the mid 80s, Ada had her own stories and marriages..once she moved in with the Cory's..she became more supporting..but she co owned Mary's and than Paradise Cafe..plus had a brief fling with her old high school flame..who called her 'bubbles'.
Rachel lost her sarcastic edge and drive once JFP took over. Oddly, she was the bright spot in the Jordan Stark story. She was again Rachel..with drive, saracism, and also lost the weird accent she adopted.
My theory was always to show Frannie still had lousy taste in men...and I think the original reason she was probably killed was for the money (if rumors of the original killer being her husband were true).
It turns out I was right Killing off Dennis is so stupid and it's definitely another one to add to the likes of Abi, Steven, Lucy etc. He was literally reaching the age where he could have decent story potential in about 2 or 3 years. A link to Den and Dennis, I mean really, what a stupid move. They never learn, do they?
Bridget was certainly always a supporting character, never really had any desires of her own. I don't know if it was ever clearly defined when Vicky's adoptive parents (Grace and Philip Carson) were supposed to have died. On the one hand it was supposed to explain why Vicky had been raised poor and was so close to Bridget, but on the other Vicky treated Bridget more like a servant than a parent. That suggests to me that Vicky must have been old enough to think of Bridget as an employee before she lost the Carsons.
Ada was a more fully-realized character and had her own storylines independent of Rachel from time to time.